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Welcome to Mountain Avenue Animal Hospital!

Mountain Avenue Animal Hospital provides quality veterinary care for cats, and dogs in Ontario, CA and the surrounding communities. 

We are committed to treating our patients with compassionate hearts, gentle hands, kind words, and superior care. Additional pet services include pet laser therapy and pet grooming.

For new clients, please call (909) 986-4548 today to make an appointment for your pet. For returning clients, please book an appointment online

6 Ways to Prevent Your Pets from Getting Lost

July is National Lost Pet Prevention Month. With more pets going missing during the 4th of July weekend than any other time of the year, it's crucial to safeguard our furry friends from backyard parties, loud fireworks, and summer vacations. Keep your pets safe and secure this summer.

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1155 N Mountain Ave
Ontario, CA 91762

Monday: 8:00am  - 6:00pm
Tuesday: 8:00am  - 6:00pm
Wednesday: 8:00am  - 6:00pm
Thursday: 8:00am  - 6:00pm
Friday: 8:00am  - 6:00pm
Saturday: 8:00am  - 1:00pm
Sunday: Closed

Saturday hours are subject to change!
View emergency pet care information >

View our holiday hours and closings >