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When is my dog considered a senior and what changes should I expect?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Male | neutered | 7 years and 11 months old | 43 lbs

At what age is a dog considered senior?

1 Answer

Most Helpful Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on November 12th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! This depends on the breed and size of the dog to some extent. For a small breed dog it would be like 10 years of age and for a large breed dog it would more like 8-9 years of age. Have a great day!

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