Lake Zurich's
Trusted Veterinarians

Come see why our clients rave about us!

Companion Animal Hospital Lake Zurich is conveniently located on Rand Road, only a couple of miles from beautiful Lake Zurich itself. With an open and spacious layout full of state-of-the-art equipment, multiple exam rooms and even wrap-around parking, we are here to provide you and your pet with all the resources you need in order to get the best possible care.

Whether you are coming from Lake Zurich, Barrington, Buffalo Grove, or another surrounding area, the team at Companion Animal Hospital will be there to warmly welcome you and your pet. Our veterinarians believe that quality medicine, along with healing and helping your beloved pets, also benefits you. Just like any other close family member, their well-being is essential to your own.

We are here to service the cities of Lake Zurich, IL, Barrington, IL, Palatine, IL, Hawthorn Woods, IL, Wauconda, IL, Kildeer, IL, Long Grove, IL, Grayslake, IL, North Barrington, IL, Deer Park, IL and more!

Call (847) 438-3750 or request an appointment online to get started!

Hear what our clients are saying about us

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★★★★★ We had a great experience at Companion Lake Zurich. We were ushered to a room immediately to calm the cats. Instructions for medication were clearly communicated and printed out. When one of my frightened cats had an accident, they cleaned him up ... and his carrier as well. They went above and beyond. And they did all of this with a smile. Thanks!Kari M.Kari M. ★★★★★ Great experience- very quick and answered all of our questionsJim L.Jim L. ★★★★★ Companion Animal Hospital Lake Zurich is a great place to take your pets who are a very valued member of your family!! It is a very clean, impressive facility that is staffed with very friendly, professional, polite and helpful Staff!! We recently acquired two new kittens and researched Companion and are extremely happy with our first visit and experience!! For your valued pets, I recommend Companion very highly!! Have a great day!!Jeff K.Jeff K. ★★★★★ Easy to schedule appointments and thorough exams. My dog's luxing patella has improved with the medicine prescribed so I am happy with the treatment provided thus far.Elizabeth L.Elizabeth L. ★★★★★ Great, great service! Dan the Veterinarian is just amazing!! I (and my dog, Klaus) highly recommend him.Bill H.Bill H. ★★★★★ Thank you Dr Marrinan and team for your professionalism and care! I’ve had an emergency with my cat Roxy and was able to get in the same day. Her infection was treated and we were on our way home to recover within an hour. Thank you again Dr M, Jasmine, and team!evgeniya I.evgeniya I. ★★★★★ The doctors are phenomenal, and the staff is fantastic. When our little guy was sick, they got us in straight away, ran the labs immediately, sent us to the emergency hospital, and called ahead. By taking care of testing and giving fluids to our puppy before he went to the ER, they saved his life. We are indebted; your professionalism is only superseded by your kindness. Thank you.Rizvana Z.Rizvana Z. ★★★★★ Great customer service and friendly staff.Sonya A.Sonya A. ★★★★★ Had an emergency with my cat and they were able to see him the same day. Every single staff member we interacted with was amazing. My cat was treated like their own and he was back to normal the following days after our visit. Definitely recommend this place for anyone looking for a good place to take their pets!Kim De A.Kim De A. ★★★★★ Fabulous care. Staff is compassionate, professional, knowledgeable, and friendly staff. Highly recommend!Allison A.Allison A. ★★★★★ The staff is very friendly and knowledgeable.NicoleNicole ★★★★★ The people and services at Companion LZ are the BEST. Professional and kind, I wouldn't take my dog anywhere else.Nick R.Nick R. ★★★★★ Our dog Chief receives very good care at Companion. Chief is not an easy patient, but the staff at Companion gets the job done well.Jane H.Jane H. ★★★★★ Hello , on Christmas eve day my Mother in laws cat that her and cat live with us has had problems well it got so bad we made the decision to have him cross the rainbow I called they were busy but knew how important it was and said they would help me right now bring him inWonderful people, this place cares about your fur baby and youDan S.Dan S. ★★★★★ Great staff and always accommodating!jennifer R.jennifer R. ★★★★★ I had to bring my kitten here as an emergency because he wasn't drinking or eating water and they were able to squeeze me in which I was so appreciative of. I can't express enough how kind and helpful the staff was. Between the doctors, the tech, the receptionist - all around a 5 star staff. I've had experiences with other vets offices being rude towards me so this was a surprising experience as I just chose to go to this location at random in leu of the emergency I had. I was impressed at how thoroughly they explained all the information I needed to know and the costs of everything. I could tell that they genuinely cared about getting my kitten the care he needs. I felt like they really listened to everything I had to say and all of my questions. It's important to note, my kitten is back to eating and drinking water as normal after the appointment. Hands down my favorite vet in LZ now. 🙂Cynthia S.Cynthia S. ★★★★★ I took my rescue kitten to Companion Animal Hospital in Lake Zurich and could not have had a better experience. Upon my first call to their location they were able to articulate to me the out-of-pocket costs for the procedure so I could be prepared. The day before the procedure they called me to remind me about withholding food and water before surgery. And then they called me back to make sure I understood the cost and to see if I had any questions. When I dropped the kitten off I got such a good vibe from the place that I got her outstanding booster shot done while I was there. While she was under they trimmed her nails at no cost to me. A nice touch. When she was ready I got a call to come get her. At pickup post surgical treatment was explained to me. The next day they called to see how she was doing. I own a pet sitting service and use lots of vets. This was a top notch experience from booking to recovery. Thank You!Margaret R.Margaret R. ★★★★★ Good staff, good stuff, good doc! I've been to about 2 different vats in the last 2 years and this one by far the best!Serg BSerg B ★★★★★ I love this animal hospital! My dog is fear reactive and they are fear-free ❤️ Meaning they use tactics for vet practices to help the animals feel more comfortable in what an animal sees as a scary place. The vet & techs explained everything well and were friendly and understanding. So glad we can bring Cortana here!Courtney D.Courtney D. ★★★★★ The staff and vets at Companion Animal Hospital Lake Zurich are extremely knowledgeable and delivers great care each time! Whether it’s spaying your dog or cat, preventative care, or urgent services the team is always consistent, caring and considerate of the pets in care and their families as well. This team delivers by far service that is in my opinion worth driving over an hour for and I have because they are a team you can truly trust! Thank you for taking great care of my fur babies! (Skye Moon, Rainbow Brite, Della Rose and Luna Puma)Lorena M.Lorena M. ★★★★★ We had an excellent experience with this animal hospital. The staff are very friendly, helpful and considerate. They took time to answer all questions and sent us home with detailed instructions. They also kept me up to date via text which was much appreciated. Highly recommend based on our positive experience.Carrianne L.Carrianne L. ★★★★★ All of the staff are kind, thoughtful and are empathetic to the pets needs. Time is taken to explain what the plan is. I know they are caring for my furry kids🐶PATTI W.PATTI W. ★★★★★ We came in when my Bugsy was sick and they took great care of him/us.Vanessa Marie G.Vanessa Marie G. ★★★★★ Our senior dog had stopped eating, and was very lethargic. Even though we are not a regular patient, the staff was able to squeeze us in immediately,despite being booked full. Everyone was beyond kind and professional, discussing diagnosis,possible treatment, and possible outcomes, while not pushing us to hurry on a decision. We came home with solutions to try, following some in office medication. I especially appreciated the discussion of the cost before any action was taken. We are hoping for improvement over the weekend. I hope that we did not negatively impact the schedule too much.Anne V.Anne V. ★★★★★ Very nice, and took great care of our dog.Molly of Psyche M.Molly of Psyche M. ★★★★★ Staff was very friendly and Dr.Mike is wonderful. I got answers to all my questions without rushing. Dr.Mike also suggested a healthy pet plan with food n activity. My pet got his vaccinations.Had to wait a bit but overall v.good experience with Companion Animal hospital.Neeta H.Neeta H. ★★★★★ Amazing staff and very friendly. Felt very welcoming and comfortable.Luis R.Luis R. ★★★★★ Absolutely stunning staff and very knowledgeable and friendly doctor. Very helpful and will recommend very highly!!!!!Sara S.Sara S. ★★★★★ I’m a skeptical person by nature, but I was exceptionally happy with each and every interaction I had. Would definitely recommend.David HDavid H ★★★★★ Friendly, professional staff, and Dr. Marrinan is wonderful. Kind, gentle, tranquil with both the patient and us humans. Every question I had was answered thoroughly, never rushed. Competent, caring, compassionate. Their new office space is great, too: comfortable, solid, and squeaky clean. And I've appreciated their careful health protocols during covid. Very glad to be with this veterinary practice and would recommend them to anyone.Catherine S.Catherine S. ★★★★★ I am new to being a doggie dad but they made me feel very comfortable and Ollie warmed up to the staff and doctor fast and loved the attention.FreddieFreddie ★★★★★ Excellent! Dr.Priest and the vet tech were so friendly and patient with our cat Bella. She was able to fit us in same day. Companion will be our new go to. Thank you!N S (.N S (. ★★★★★ They were so so great with my two kitties, I am definitely coming back!Zabrina D.Zabrina D. ★★★★★ Couldnt say nicer things about this practice. I am from out of state and had an animal that needed medical attention. They were so accommodating and helpful. If I lived in this area, this is absolutely the place my animals would go.Jeannie C.Jeannie C. ★★★★★ I am Used to family practice vets. So When I had to change to a cookie cutter big time animal hospital I was afraid. I did have to go through a few doctors but that is how it is. I found MICHAEL MARRINAN, D .V.M. HE takes care of my 2 cats and Dog. I think He is mid age to so he is willing to learn all the new Vet stuff. Get Him if you want someone that treats your animal like family and not now serving number 32. Also Amazing Staff! Go Lisa! I forgot to Add a a couple things! So I can only lift 20 pounds so they helped bring them in and out of the car. The other thing is I thing when they take the pet in the backroom and you cant watch they are giving them I just do not like that, So! if you ask they will do it in front of you!Ed B.Ed B. ★★★★★ Very professional staff! Will be back!Kevin D.Kevin D. ★★★★★ We have been so happy with the care our pets receive here. Very thorough in examination, explanation and recommendations!Nancy S.Nancy S. ★★★★★ Companion Animal hospital Lake Zurich are very caring, nonjudgemental, and knowledgeable. My dog got spayed and they were patient and answered all questions. This was the 2ed visit and each one we were greeted with friendly staff. Jasmine her tech was gentle and caring with her. So happy we found this vet!Jackie M.Jackie M. ★★★★★ Very caring.Janet D.Janet D. ★★★★★ I went in for emergency urgent care as our usual veterinary hospital was closed this 4th of July weekend. Not only did they see us but we were given availability options and never once rushed the entire time . It was assuring already over the phone even though I was in a panicked state, I mean this is my precious baby injured. I honestly didn’t let my family around her that’s how guarded I was. Once we got there every aspect of the experience was ideal. I was blown away by the care, ease, and level of efficiency and bedside manner of all the staff and Dr. Mike. I honestly didn’t think it was possible to have such a flawless experience start to finish especially under the circumstances. My girl is nowhere near out of the woods but I have full confidence this place is going to follow up and help me make decisions and ensure the comfort of my pet every step of the way. I literally asked them if and how we could make them our new care providers before we even checked out. I don’t know how I was taking her our previous vet before this place. Honestly coming here is going to be the best choice you make for your pet and your sanity.NausheenNausheen ★★★★★ They were great with our puppyKevin Q.Kevin Q. ★★★★★ A fantastic local animal hospital that takes great care of your pet. I only recently started going to Companion Animal Hospital at Lake Zurich, and I could not be happier with my decision. The staff is so caring, knowledgeable and kind. They have gone out of their way to help and it means more to me than I can express. Thank you!Yulia S.Yulia S. ★★★★★ Updated review 6/8/21: The Companion Animal family continues to provide us superb service! We just had one of our kitties get a dental and tooth extraction. The level of patience and professionalism displayed by all who helped our kitty today was wonderful! We are always thankful that they take time to provide details of procedures. Thanks for another great visit!!We love the Companion Animal family. They always are so kind! We love that they listen patiently as we detail what is going on, and they provide solutions that are well described by both the vet and nurses. We highly recommend this vet!Becca G.Becca G. ★★★★★ I can’t recommend Companion Animal Hospital in Lake Zurich enough! Dr. Marrinan and his team were amazing through the entire processLauren W.Lauren W. ★★★★★ It was a wonderful experience. The staff is amazing, and very kind and knowledgeable!Cassie R.Cassie R. ★★★★★ I have been taking my dog to this hospital since the day I adopted her. The doctors, nurses, and reception give you a pleasant experience every time you call or visit. I truly feel that your pet is treated like family when visiting this location. Than you to the team at companion animal hospital for all you do.-ChristianChristian P.Christian P. ★★★★★ Our dog Titan was very sick and when our local vet said they couldn’t see him for 2 weeks (due to COVID) we called Companion in Lake Zurich who got us in right away. Lisa at the front desk sounded caring and understood we were worried. She even texted us to let us know of a cancellation to get us in sooner. Sadly, we found out our poor boy has a tumor. The doctor called us after meeting him and reviewing his X-rays. The doctor was so compassionate as my husband and I cried to hear the news and I truly felt comfort in her words. She said she could hear how much he was loved. We have him on steroids now, hoping that will make him more comfortable until our sons come in from out of town and have a chance to say goodbye to our “pretty boy”. Thank you Companion Animal Hospital Lake Zurich for your compassion and what you do.Lisa R.Lisa R. ★★★★★ What a breath of fresh air Companion Hospital has brought to our community. Dr. Mike answered every single question I had and was very patient with me. The staff is amazing and really nice. I highly recommend to all my clients and friends! LoisLois B.Lois B. ★★★★★ Wonderful and compassionate clinic. Would highly recommend them. Staff was also great to work with.Carla V.Carla V. ★★★★★ The office to the vets were extremely helpful with helping me with my puppy. They addressed any questions I had and were very professional and understanding. Definitely will return and use them for my puppies vet needs.Noodle N.Noodle N. ★★★★★ Everyone at Companion Animal Hospital has made our pet's visit a pleasurable one. Very professional, kind and helpful and always with a smile. Highly recommend this place. Love the new location. Neat and clean!Xanthi Z.Xanthi Z. ★★★★★ If you are a little over the top with spoiling and babying your dog like me then this is the place for you! My dog is my world and the entire staff are unbelievably caring, loving and compassionate with her. Dr. Marrinan is absolutely wonderful. He is always kind, calm (which is greatly appreciated by a nervous mommy), professional, empathetic in difficult situations and extremely patient with me. He takes the time to explain everything so that I understand and makes sure all my questions are answered. And to top it off, I can always get her an appointment in a timely fashion. After reading some of their older reviews it seems this practice changed ownership recently. If you've had a poor experience with them in the past I would highly recommend giving this new staff a try, you won't regret it.Laura D.Laura D. ★★★★★ Our 14 year old dog, Penny, was slowly showing health issues that we knew meant it was time for her to cross over the rainbow bridge. I called Lake Zurich Companion care several times over the last 2 months to find out how they handled euthanasia. My questions were always answered in detail with compassion & concern. I knew the day was coming - Penny kept falling & each day it was harder and harder to get her back up. Finally, last week she stopped eating. I knew it was time to schedule an appointment with Companion Animal Hospital. My son & I brought Penny in on Friday 2/5. After calling to let staff know we were in parking lot 2 staff members came out to assist in getting Penny into the clinic Everyone was so compassionate and kind. Dr Mike discussed Penny’s health & we agreed it was time for her to go to sleep. Dr Mike thoroughly explained what was going to happen and gave us plenty of time to be with Penny and give her lots of love as she made that crossing over the Rainbow Bridge. I can’t say enough about the care Penny (and her humans) received. I plan on being our other pets here for care in the future. Thanks! Sorry, I remember Jasmine as being one of the tech’s who helped but can’t remember other names. I know there were several other people who were awesome!Angela S.Angela S. ★★★★★ Dr. Marrinan and his staff have been very professional and thorough with our senior dog’s care. He takes a lot of time answering questions. I would highly recommend Companion Animal Hospital.Anne P.Anne P. ★★★★★ Took my dog to this vet yesterday. Our 90 pound pup is super scared of vets and thought we’d try this “fear free” one since his fear was getting worse with our last vet. They listened to our suggestions and took the time to figure out a way to make him comfortable enough to get his annual shots in, etc. Can’t say how thankful we are that they took the time to make it work for our pet. Highly recommended!Chief 2.Chief 2. ★★★★★ I usually take my cat to a different vet in LZ, but they blamed Covid for a reason they couldn't see my cat for an emergent visit. So I called Companion and they set me up with an appointment right away. I was so grateful. The doctor called me after examining my cat and he sounded so nice. He diagnosed my cat accurately and provided the exact treatment I would want and expect without me having to ask. My cat was feeling much better in a couple days. I'm so happy that Companion could be there for us when we needed them. The whole visit was easy and alleviated much of my stress over the situation. I'll be bringing my cat here from now on.Whitney S.Whitney S. ★★★★★ As a new client, from the phone call to set up the appointment to the appointment itself, I found the staff that I dealt with to be very pleasant, professional and informative. The nurse that was taking care of my dog met me promptly in the parking lot to pick him up (COVID) and inquired about any pre-existing conditions he might have to better accommodate his needs. When she brought him back out to me, she was very informative on how the appointment went. Overall, I was very pleased with the entire experience and definitely feel confident in having them treat my dog in the future.Patti B.Patti B. ★★★★★ Companion Animal Hospital has a team of very caring staff members. I trust their care when they have my kitty Molly and would highly recommend them to anyone who needs a vet.Danielle A.Danielle A. ★★★★★ Wonderful care~ very attentive & knowledgeable.FeatherstoneFeatherstone ★★★★★ Great staff and doctors! They're really committed to helping you. The doctors here actually care and speak to you like a person, unlike other places who just rush you out the door.These vets and techs really do care about your pets and the well being of animals in general.Even though they may be booked up they do their best to accommodate your pets needs and will even squeeze you in if needed. Why because they care!Being a vet is a hard science, but they do it well here!!!Jerry OJerry O ★★★★★ I was in a bind with my primary vet and called Companion for help. They had an opening in a few hours and dropped off my dog. After his visit the vet called and spend 20+ minutes on the phone with me walking me through everything they did with him. I have never had a vet spend the time like Dr. Mike did. I really appreciate the quick service and compassion Dr. Mike and the rest of the staff showed. Thank you for helping make my dog better!Ryan B.Ryan B. ★★★★★ The staff here is extremely friendly and definitely make you feel as though your fur baby is theirs! The doctor was very thorough in going over all of the options for my dog as well as potential concerns moving forward with treatment. I will be returning for all future vet visits and would recommend them to anyone in need of vet services.Christina F.Christina F. ★★★★★ I had a last minute situation where we found a new family to take in our cats in due to our allergies. We needed to get them checked up at the vet ASAP. Companion was extremely responsive and willing to do anything to get our cats in. I was so impressed with their communication and willingness to work with our family! We got very great thorough reports on the cats emailed to us and that was extremely helpful. I would 100% recommend Companion Animal Hospital!Alyssa G.Alyssa G. ★★★★★ Great staff. Very sweet. Very thorough in explaining my issue with my dog. Today was my first day at this vet and I am moving my records over. Very Happy and close to home.jodi G.jodi G. ★★★★★ Awesome staff, prompt and professional service!!Gwen G.Gwen G. ★★★★★ Brought in out little havapoo for his first vet visit Doc was amazing. This is our first time owning a pet and he gave me some really good pointers and understanding, definitely will be back ! Thank youThe Ramírez S.The Ramírez S. ★★★★★ When my regular vet couldn't get my cat in for over 48 hours and I knew she needed someone sooner, I started calling around. Companion was the only place willing to fit her in. They ran lots of tests to try and figure out what was wrong with my cat and since this was during the pandemic they called and gave us plenty of updates while we waiting outside. When it come down to the nitty gritty, they admitted she would do better at a speciality clinic. I thought I would walk out of there having spent so much but my goodness I was in awe of how low my bill was! Without a doubt for many reasons of my experience with them today they will be my cats' new primary vet. They cared for my cat so well and I'm so thankful.Aerin L.Aerin L. ★★★★★ I needed care for my cats paws right away after going to a groomer and they said her claws have embedded in her paws, I called Companion Animal Hospital and they took her in right away with a last minute phone call. they gave her great care. Such personable and caring people here, my cat is now happy, and i’m happy I have found a vet I can trust to keep my cat healthy and happy. I highly recommend.Bianca N.Bianca N. ★★★★★ Always good care6/23/2020Your staff was very kind and informativewith our older cat Chloe.I was given very clear information anddetail from the test results.The treatment plan we discussed was clear but will not be needed now.She was very sick and passed at home.Thank you for your kind care.DAvid P.DAvid P. ★★★★★ We rescued our sweet pup from Paws and Affect Animal Rescue. The rescue has an agreement with Companion where they cover a majority of the cost to spay or neuter your pet. I was hesitant to take my fur baby to someone other than her regular vet, but our experience was as pleasant as it could be. From the person who answered the phone to the vet techs who came and got and then dropped off my pup, everyone was kind, efficient, and professional. I felt confident taking my post-op pup home with the instructions I was given. If I didn’t grow up going to the same school as my current vet, I would definitely consider Companion. Thank you for taking good care of my sweet puppy!Becky T.Becky T. ★★★★★ Everyone listened to the needs of what my dog needed and responded well to his anxiety. Before they did anything they went over the findings and talked things over.sweet S.sweet S. ★★★★★ This is my first time bringing my new rescue dog here.The Dr was very helpful and professional and kind.Seems very thorough and I will be back again.Thank you!Life T.Life T.js_loader


9:00am - 6:00pm


9:00am - 6:00pm


9:00am - 3:00pm


9:00am - 6:00pm


9:00am - 6:00pm


8:00am - 2:00pm



Our Services

Our animal hospital can provide complete care to your pet so they can enjoy a lifetime of excellent health. We take a personalized approach to our patients’ medical needs, utilizing our services to best suit their circumstances.

What's Next

  • 1

    Call us or schedule an appointment online.

  • 2

    Meet with a doctor for an initial exam.

  • 3

    Put a plan together for your pet.

Our senior dog had stopped eating, and was very lethargic. Even though we are not a regular patient, the staff was able to squeeze us in immediately,despite being booked full. Everyone was beyond kind and professional, discussing diagnosis,possible treatment, and possible outcomes, while not pushing us to hurry on a decision. We came home with solutions to try, following some in office medication. I especially appreciated the discussion of the cost before any action was taken. We are hoping for improvement over the weekend. I hope that we did not negatively impact the schedule too much. 

Anne Voss

We came in when my Bugsy was sick and they took great care of him/us.

Vanessa Marie Guillemette

We came in when my Bugsy was sick and they took great care of him/us.

Vanessa Marie Guillemette

We had an excellent experience with this animal hospital. The staff are very friendly, helpful and considerate. They took time to answer all questions and sent us home with detailed instructions. They also kept me up to date via text which was much appreciated. Highly recommend based on our positive experience. Read Less

Carrianne Ludwig