The muzzle is going grey, the naps are getting longer, and your once-ravenous Labrador now sniffs dinner with the discernment of a restaurant critic. Feeding a senior dog isn’t just “the same food, less of it” — ageing changes everything from metabolism to kidney function to dental comfort. Get the nutrition right and you can genuinely add healthy, comfortable years. Here’s what senior dogs actually need.

When is a dog “senior”?

It depends on size — one of the crueller ironies of dog ownership is that the biggest dogs age fastest. Roughly: small breeds (under 10kg) are senior around 10–12 years, medium breeds around 8–10, large breeds around 7–8, and giant breeds as early as 6. But chronological age matters less than the individual: some nine-year-old Labradors are still bouncing; some seven-year-olds are stiff. Let your vet’s assessment and the dog’s condition guide you, not just the birthday.

What changes with age (and why food matters)

• Metabolism slows. Senior dogs typically need 20–30% fewer calories than in their prime. Feeding the same amount produces the most common senior-dog problem: gradual, unhealthy weight gain that worsens arthritis.
• Muscle wastes. Ageing dogs lose lean muscle (sarcopenia). They need more high-quality protein per calorie, not less — the old advice to cut protein for seniors has been overturned by research.
• Kidneys work harder. Reduced kidney function is common; moderate phosphorus and adequate hydration help. This doesn’t mean protein restriction for healthy seniors — only for dogs with diagnosed kidney disease, on vet advice.
• Joints deteriorate. Omega-3 fatty acids (EPA/DHA from fish oil), glucosamine and chondroitin support joint comfort. They’re not miracle cures, but the evidence for omega-3s in arthritic dogs is solid.
• Digestion gets fussier. Highly digestible foods, smaller more frequent meals, and consistent routines suit ageing guts.
• Teeth hurt. Dental disease is rampant in older dogs. If your senior suddenly prefers soft food or drops kibble, dental pain — not fussiness — is the likely cause.

Choosing a senior food: what to look for

A good senior diet (look for foods labelled for seniors or “7+”) typically offers: controlled calories with high-quality protein maintained, added omega-3s, joint-support ingredients, moderate fat, and enhanced palatability (older noses are less keen). In the UK, reputable senior ranges come from Royal Canin, James Wellbeloved, Burns, Arden Grange, Lily’s Kitchen and others across price points. Price isn’t everything — compare the actual nutritional analysis, not the marketing.

Wet vs dry: wet food’s higher moisture content aids hydration (good for kidneys and older dogs that drink less), and its softness suits sore mouths. Dry food is cheaper, better for teeth (marginally), and easier to portion. Many owners mix — and for seniors, that’s often ideal. Whatever you choose, transition over 7–10 days; older digestive systems rebel against sudden changes.

The weight question: the most important thing

If you do one thing for your senior dog, keep them lean. Study after study shows lean dogs live up to two years longer than overweight ones, with dramatically less arthritis. Yet most senior dogs in the UK are overweight — owners keep feeding prime-of-life portions to a slower metabolism, and “a bit of extra” becomes a lot.

Learn body condition scoring: you should feel ribs easily under a light fat cover, see a visible waist from above and a tucked abdomen from the side. Weigh the food (kitchen scales, not scoops — scoops overfeed by 20% routinely), cut treats to 10% of calories, and weigh the dog monthly. If your dog needs to slim down, do it gradually under vet guidance — crash dieting is as bad for dogs as for people. The principles mirror sensible weight management generally: consistent, moderate, sustainable.

Dental care: the forgotten senior need

By age three, most dogs have some dental disease; by seniority, it’s the rare dog that doesn’t. Tartar, gum inflammation and rotten teeth cause chronic low-grade pain that suppresses appetite, and dental bacteria seed the bloodstream, stressing kidneys and heart. Yet dental care is the most neglected part of senior dog health. Brush teeth a few times weekly with dog toothpaste (never human — xylitol is toxic), offer dental chews with proven efficacy (look for the VOHC seal), and accept your vet’s recommendation for a professional dental clean under anaesthetic when needed — the “risk of anaesthetic in old dogs” is far smaller than the risk of leaving rotting teeth. Many owners report their “old, slow” dog acting years younger after a dental — because they’ve been in pain for months.

Supplements: what actually helps

The supplement aisle is a minefield of hope and marketing. What’s evidence-backed for seniors:

• Fish oil (omega-3 EPA/DHA): good evidence for joint comfort and coat/skin health. Use a pet-specific product with proper dosing — human capsules are often the wrong concentration.
• Glucosamine/chondroitin: modest evidence; reasonable to try for arthritic dogs, but don’t expect miracles.
• Probiotics: useful for dogs with sensitive digestion; choose veterinary-formulated products.

What’s dubious: most “senior vitality” blends with fairy-dust ingredient levels, and anything promising to reverse ageing. And never give human supplements (especially those containing xylitol, iron or vitamin D at human doses) without vet approval — some are toxic to dogs. The PDSA’s senior dog guidance is a trustworthy UK reference for separating sense from salesmanship. The Kennel Club’s health pages cover nutrition through every life stage.

Feeding routine for the older dog

• Two or three smaller meals rather than one large one — easier on digestion and keeps energy steadier.
• Warm the food slightly to release aroma — older noses need encouragement.
• Elevated bowls for dogs with neck arthritis or megaoesophagus — less strain, less regurgitation.
• Fresh water always — consider a second bowl; some seniors drink more but walk less far to do it.
• Consistent times — routine reduces anxiety in dogs experiencing cognitive decline.

Watch for the red flags that mean “vet, not food change”: sudden appetite loss, drinking much more than usual, rapid weight loss, vomiting, or difficulty eating. Senior dogs should see the vet every six months — catching kidney disease, dental disease or tumours early changes outcomes enormously. Regular health checks matter as much as nutrition; staying registered and attending check-ups is good advice for every species.

Conclusion

Feeding a senior dog well means adjusting to their new reality: fewer calories but quality protein maintained, joint-supporting omega-3s, digestible food in smaller frequent meals, weight kept lean above all else, and dental pain ruled out when appetite changes. The grey muzzle years can be wonderful — calmer, deeper, full of quiet companionship — and good nutrition is how you make them as long and comfortable as possible. They gave you their best years; the least you can do is feed them like it matters. It does.

Frequently Asked Questions

Should senior dogs eat less protein?

No — this is outdated advice. Healthy senior dogs need high-quality protein maintained (or increased per calorie) to prevent muscle wasting. Only dogs with diagnosed kidney disease need protein restriction, on veterinary advice.

How much should I feed my senior dog?

Typically 20–30% fewer calories than in their prime, adjusted to keep them lean. Weigh food with scales, follow the senior food’s guidelines as a starting point, and adjust based on body condition.

Is wet or dry food better for older dogs?

Both work; many owners mix. Wet food aids hydration and suits sore mouths; dry is economical and convenient. Choose based on your dog’s teeth, kidneys and preferences.

Why has my old dog suddenly gone off food?

Common causes: dental pain, nausea, kidney disease, or cognitive decline. Don’t assume it’s “just age” — a vet check is warranted for any sudden appetite change in a senior dog.