Senior Pets · July 12, 2026 · 5 min read
Feeding Your Senior Dog: What Changes and Why
Older dogs often need fewer calories but more attention to protein quality and joint support. Here's what typically changes and when to start.
Most dogs are considered senior somewhere between 7 and 10 years old, earlier for large and giant breeds and later for small breeds. Feeding needs shift gradually with age, mainly around calorie needs, joint support, and easier digestibility -- not a single dramatic switch on a birthday.
Calorie needs typically decrease
As dogs age, activity level and lean muscle mass tend to decline, which usually lowers total calorie needs. Feeding a senior dog the same portion they ate as a younger adult is one of the most common causes of gradual weight gain in older dogs -- recalculating their calorie target as they age helps catch this early.
Protein quality matters more, not less
Older dogs benefit from adequate, high-quality protein to help maintain muscle mass, even though total calories often go down. Unless a vet has specifically recommended protein restriction (for example, for certain kidney conditions), healthy senior dogs generally shouldn't be moved to a low-protein diet by default.
Joint support and digestibility
Many senior-formulated foods add joint-supporting ingredients (like glucosamine and chondroitin) and are formulated to be gentler on digestion, which can help with the arthritis and slower digestion that become more common with age.
When to involve your vet
Any noticeable weight change, appetite change, or new digestive issue in a senior dog is worth a vet visit -- these can be normal aging changes, but they can also signal an underlying condition that's easier to manage when caught early.
Frequently Asked Questions
At what age is a dog considered senior?
It varies by size: large and giant breeds are often considered senior around 6-7 years old, medium breeds around 8-9, and small breeds closer to 10-11, since larger breeds generally have shorter lifespans and age faster.
Do all senior dogs need fewer calories?
Most do, since activity and muscle mass tend to decline with age, but it's not universal -- some senior dogs, especially those with muscle loss or illness, may need more calories, not fewer. Recalculating rather than assuming is the safer approach.
Should I switch my senior dog to a low-protein diet?
Not by default. Adequate high-quality protein helps preserve muscle mass in aging dogs. Protein restriction is typically only recommended for specific medical conditions and should be guided by a vet.
Medical Disclaimer
This tool provides general, educational estimates and is not a substitute for professional veterinary advice, diagnosis, or treatment. This article provides general educational information and is not a substitute for professional veterinary advice. Always consult your veterinarian about your pet's specific health needs before making changes to their diet, water intake, or care routine.
Put This Into Practice
Sources
- American Animal Hospital Association (AAHA) Canine Life Stage Guidelines
- WSAVA Global Nutrition Guidelines