🐾 The short answer
Dogs become "senior" at different ages: small breeds at 9–10, medium breeds at 8, large/giant breeds at 6–7. Whenever your dog hits senior, their feeding needs shift. Senior formulas exist for a reason.
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✓ Lower calorie density
Activity drops as dogs age. Senior formulas have ~10–15% fewer calories per cup to prevent age-related weight gain.
✓ Higher quality protein
Older dogs lose muscle mass. Look for highly digestible protein sources (chicken, lamb, fish) — and more of it, not less.
✓ Joint-supporting ingredients
Glucosamine, chondroitin, and omega-3 fatty acids are essentially required for senior formulas.
✓ Easier-on-the-stomach options
Many seniors develop sensitivities. Limited-ingredient and probiotic-enhanced formulas help.
🛒 Where to shop
These are the food categories most senior dog owners buy from Chewy. Pick a brand and size that matches your dog's weight and activity.
❓ Frequently Asked Questions
When should I switch to senior dog food?
Small breeds: around 9–10 years. Medium breeds: 8 years. Large/giant breeds: 6–7 years. Talk to your vet at your senior dog's wellness exam.
How much should I feed a senior dog?
About 10–20% fewer calories than an adult of the same weight, unless they've already lost weight. Use our Dog Feeding Calculator and dial down 15% as a starting point.
Is wet food better for senior dogs?
Often yes — softer texture is easier on aging teeth, and the higher moisture content supports kidney health. A mix of dry and wet works well.