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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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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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They Love Us

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.

Dr. Diane Cosko and her talented staff have been caring for our pets for decades. They go the extra mile every time. Very thorough and knowledgeable.

Alice C.

Every doctor should be as committed to their patients as Dr. Cosko is. I completely trust her and if she says something needs to be done, you can rest assured it’s in the best interest of your pet.

Amy B.

Our family has been a client of Mountain Aire for almost 20 yrs. Dr. Cosko is an excellent veterinarian and I appreciate the care she and her friendly staff have given all of our animals during this time. We are blessed to have access to such a fantastic veterinary hospital here in our mountain communities!

Melodie S.

My pet is well cared for and we felt the love for our little dog. We appreciate all of the staff. We are on the mountain part-time and it certainly feels great to have a veterinarian while we are there.

Tony H.
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