What to Feed a Senior Dog: Nutrition Needs as Dogs Age
At a glance
- Senior dogs need more protein, not less — ageing muscles require it to stay strong
- Digestibility matters more as dogs age — their gut becomes less efficient at extracting nutrients
- Joint support through omega-3 fatty acids and glucosamine is a priority from around age 7
- Calorie needs change, but cutting food without adjusting nutrient density causes muscle loss
- A vet check at least once a year helps catch underlying issues that affect nutritional needs
When does a dog become a senior, and what actually changes?
Senior dogs need food that works harder for them — higher in quality protein, easier to digest, and richer in joint and anti-inflammatory support. Most dogs are considered senior from around 7 years old, though large breeds like Labradors cross that threshold closer to 5 or 6, while smaller breeds often stay in good shape well into their teens.
The changes that come with age are real and gradual. Muscle mass starts to decline — a process called sarcopenia — and the body becomes less efficient at using protein to maintain it. The digestive system slows down. The immune system needs more nutritional support to function well. Joints start to feel the wear of years of activity.
None of this means a senior dog is unwell. It means their nutritional needs have shifted, and the food that served them perfectly at three years old is probably no longer the best fit at ten. How and what you feed your dog across different life stages makes a meaningful difference to how well they age.
Do senior dogs need more or less protein?
More. This surprises a lot of people, because older dogs are often less active and the instinct is to cut back. But reduced activity is precisely why protein quality matters more, not less. Without adequate protein, ageing dogs lose muscle faster and recover more slowly from even minor physical stress.
The key word here is quality. Protein from whole meat sources, fish, and eggs is far more bioavailable — meaning the body can actually use it — than protein from heavily processed plant sources or meat derivatives. A food with a modest protein percentage from high-quality whole ingredients will do more for a senior dog than a higher-percentage food built on poorer sources.
Fresh food has a clear advantage here. Dry kibble and fresh food handle protein very differently — the high heat used to produce kibble degrades amino acids, reducing how much the body can absorb. Fresh food preserves those amino acids in a form the body can put straight to work.
Marleybones recipes are vet-developed and built around whole meat proteins — exactly the kind a senior dog's body can use efficiently. Their Sassy Salmon meal is worth noting here: salmon is naturally rich in omega-3 fatty acids, which support both coat condition and the low-grade inflammation that underpins many age-related joint problems.
What nutrients should you prioritise for an ageing dog's joints and digestion?
Joints first. By the time most dogs reach senior age, some degree of wear to the cartilage in their joints is inevitable. The nutrients that help most are omega-3 fatty acids (particularly EPA and DHA from fish), glucosamine, and chondroitin. These don't reverse damage, but they genuinely slow its progression and reduce inflammation.
If your dog is already showing signs of stiffness — reluctance to climb stairs, slower to get up after rest, less keen on longer walks — it is worth looking at joint support more seriously. A dedicated supplement formulated for joint health alongside a good diet gives more targeted support than diet alone.
Digestion is the other big shift. Older dogs produce fewer digestive enzymes and have a less robust gut microbiome — the community of bacteria that keeps digestion running smoothly. Fibre from prebiotic sources like chicory root helps maintain that bacterial balance. It feeds the good bacteria rather than just adding bulk. The role of fibre in digestive health is often underestimated, but for senior dogs it is particularly important.
Moisture content also matters more with age. Older dogs are more prone to dehydration and kidney stress. Fresh food carries significantly more natural moisture than dry food, which supports kidney function without the dog needing to drink more.
If your dog has ongoing digestive issues — loose stools, bloating, or irregular bowel movements — speak to your vet. These can be signs of an underlying condition rather than a simple dietary gap, and it is worth ruling that out before adjusting food alone.
How should you adjust portions as your dog gets older?
Calorie needs drop in senior dogs, mainly because activity levels fall. But the instinct to simply feed less can backfire. Cutting volume without maintaining nutrient density means the dog gets fewer calories and fewer of the protein, omega-3s, and minerals they actually need more of.
The better approach is to move to a more nutrient-dense food and then calibrate portions from there. Portion guidance for senior dogs needs to account for current weight, body condition score, and activity level — not just age. A senior dog carrying extra weight needs a different approach to a lean, active ten-year-old.
Body condition scoring — running your hands along your dog's ribs to feel whether they are well-covered, too prominent, or buried under fat — is a more reliable guide than weight alone. You should be able to feel the ribs without pressing hard, but not see them.
Marleybones Pantry Fresh meals are shelf-stable and complete for all life stages, so there is no need to switch formats as your dog ages. Adjusting the portion to the right level for a senior dog, while keeping the quality of ingredients consistent, is often all that needs to change.
Every dog is different — build your personalised Marleybones feeding and health plan tailored to your dog's age, size, and health requirements.
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FAQs
When should I switch my dog to senior food?
Most dogs benefit from a nutrition review at around 7 years old. Large and giant breeds age faster and may need that review from 5 or 6. There is no single switch-over moment — the more useful question is whether the current food still meets your dog's changing needs for protein quality, joint support, and digestibility.
Is it bad to feed a senior dog high-protein food?
No — for healthy senior dogs, high-quality protein supports muscle maintenance and is not harmful to the kidneys. The outdated advice to restrict protein in older dogs applied mainly to dogs with existing kidney disease. For a healthy senior, adequate protein is one of the most important nutritional priorities.
Should I give my senior dog supplements?
It depends on the dog. Joint supplements containing glucosamine and omega-3s are well-supported by evidence for dogs showing signs of stiffness or slowing down. Gut health supplements with prebiotics and probiotics help dogs with digestive changes that come with age. A vet can advise based on your individual dog's health profile.
Can I keep feeding Marleybones as my dog gets older?
Yes. Marleybones Pantry Fresh meals are complete for all life stages, so there is no need to change food as your dog ages. You may need to adjust the portion size as their calorie needs decrease, but the high-quality protein and natural ingredients remain appropriate and beneficial for senior dogs.
What foods should I avoid feeding a senior dog?
Avoid high-fat foods if your dog is prone to weight gain or has a history of pancreatitis. Very high-sodium foods put unnecessary strain on the kidneys. Ultra-processed foods with low-quality fillers, artificial additives, and poor protein sources become a bigger problem as the gut becomes less efficient — senior dogs have less nutritional tolerance to absorb.
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