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  • Monday, Wednesday, Friday: 9:00am - 6:00pm (Dental hygienist on 1st Wednesday each month)
  • Saturday: 9:00am - 6:00pm (Open on the Saturday after the 1st Wednesday each month)
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Lifelong Pet Care

Not your average clinic. Our comprehensive veterinary approach accounts for your pet's individual lifestyle.

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Welcome our new veterinarian Dr. Melissa Lucas

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Welcome our new veterinarian Dr. Melissa Lucas
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Providing thorough, thoughtful, compassionate, and high-quality veterinary care for the Greater Frazier Mountain Communities since 1989.

Together Let’s Care at Mountain Aire!

If you live in the Greater Frazier Mountain Area or the surrounding area in California, then you have picked the perfect site to find a veterinarian. Dr. Diane Cosko is a licensed veterinarian, treating all breeds of dogs and cats. Your pet’s health and well being is very important to us and we will take every step to give your pet the best possible care. If we can’t help you, we will work with you to help find someone that can help your pet.

Mountain Aire Veterinary Hospital, Inc. is a full service animal hospital and will take both emergency cases (during office hours) as well as less urgent medical, surgical, and dental issues. Dr. Diane Cosko is experienced in all types of conditions and treatments. Beyond first rate pet care, we make our clinic comfortable and informative. We want your 4-legged family member to look forward to meeting his or her own Greater Frazier Mountain Area veterinarian.

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Our Clients say...

Has been my vet for over 20 years. The team and Dr. Cosko are caring and kind. I have since moved away from Frazier Park but Dr. Cosko and Mountain Aire are still my vet.

Patti J.

The care we receive at Mountain Aire is excellent. Our questions and concerns are always answered promptly. Any time we have brought our pets in they have been provided with knowledgeable and professional care.

Thomas B.

Everyone at the clinic were kind and empathetic of my beloved dog’s distress as well as my worries about her. I felt that my dog’s health and well-being were a priority for them and I felt very comfortable leaving her there for a few hours.

Cindy H.

Everyone in the office was very friendly and professional. I had to leave little Alex at the client for observation all day but I knew he was in safe hands.

Dionne B.

I have never been so impressed with a veterinarian and her staff before. The Mountain Aire staff are truly caring people. They went out of their way to make sure Basil (my sweet dog) was getting the best treatment possible and also, with great patience, explained to me the things I did not understand. My only disappointment is that they do not take humans as patients – If only I could find such a thorough doctor for myself!

Susan T.

One of the reasons I bring my dogs to Mountain Aire is because of the doctor and her staff. They genuinely care about your pet and both our dogs get excited to come to visit.

Katherine S.

Fabulous service and medical treatment for our mini Dachshund.

Fred M.

Really loved the family feel and relaxed atmosphere. They really took care of us and were committed to improving our smiles.

Margaret G.

Dr. Cosko and her ENTIRE staff are the best! Gibbs & Taos love going there. When I pull into the parking lot they can’t get out of the car fast enough. You will never find a better place for the care of your pet!

Konnie R.

Wow! They all are the very best. The whole staff have been there for us every step of the way for nearly 20 years. Love and thanks to Mountain Aire Veterinary Hospital

Bob A.
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