Weight gain

Extra weight shortens a dog's life. In 50,000 neutered dogs of twelve breeds, overweight dogs had a higher risk of death in every breed, with a life-span shortfall ranging from about five months in male German Shepherd Dogs to two and a half years in male Yorkshire Terriers¹. In the well-known Labrador study, dogs fed a quarter less than their littermates lived a median of 13 years against 11.2, and their first chronic illness came two years later². Weight also drives arthritis: dogs above their breed's average weight had over twice the odds of osteoarthritis³.

Both AAHA and WSAVA ask for a nutritional assessment at every visit, with a body condition score and a muscle condition score, because weight on the scale cannot tell fat from muscle in an older dog⁴⁵. WSAVA's nine-point body condition chart is free to download; ribs easy to feel under a thin fat cover and a visible waist from above are the target⁵.

Seniors gain weight when activity drops before the food does. Weigh monthly in Oldie, cut treats before meals, and ask the vet about a diet with fewer calories but enough protein to hold muscle⁴. Unexplained weight loss is the opposite warning and deserves a visit of its own.

This is general information, not a diagnosis. Your vet knows your dog.

Sources

1. Association between life span and body condition in neutered client-owned dogs (Salt C et al.). Journal of Veterinary Internal Medicine 33:89-99, 2019 (peer reviewed). Accessed 2026-09-22.
2. Effects of diet restriction on life span and age-related changes in dogs (Kealy RD et al.). Journal of the American Veterinary Medical Association 220(9):1315-1320, 2002 (peer reviewed). Accessed 2026-09-22.
3. Prevalence, duration and risk factors for appendicular osteoarthritis in a UK dog population under primary veterinary care (Anderson KL et al.). Scientific Reports 8:5641, 2018 (peer reviewed). Accessed 2026-09-22.
4. 2021 AAHA Nutrition and Weight Management Guidelines for Dogs and Cats (Cline MG et al.). American Animal Hospital Association, Journal of the American Animal Hospital Association 57(4):153-178. Accessed 2026-09-22.
5. WSAVA Nutritional Assessment Guidelines (Freeman L et al., WSAVA Global Nutrition Committee). World Small Animal Veterinary Association, Journal of Small Animal Practice 52:385-396, 2011. Accessed 2026-09-22.