This guide is part of our ongoing journal, practical writing on how nutrition, breed and lifestyle shape canine health. Use the table of contents to jump to a section, or read straight through.
The short answer: most healthy senior dogs need fewer calories but plenty of good protein, which is the opposite of the old advice to "cut the protein". And there is no official "senior" nutrient standard, so the word "senior" on a bag is a marketing label, not a regulated recipe.
- Healthy seniors need plenty of protein, not less, to hold on to muscle.
- "Senior" dog food is not a regulated category, so judge the actual recipe.
- They usually need fewer calories as they slow down, so watch the weight.
- Only cut protein if a vet diagnoses a condition that calls for it.
The protein myth
This is the one to unlearn. The old idea that you should cut protein for senior dogs to "protect the kidneys" is outdated for healthy dogs. As dogs age they lose muscle, a process called sarcopenia, and they become less efficient at using protein, so healthy seniors actually need plenty of good-quality, digestible protein to hold muscle, not less (AKC, cited for the senior-nutrition point). Veterinary guidance often points to figures in the region of 28 to 30% protein on a dry-matter basis for healthy older dogs. The important word is healthy: a dog with diagnosed kidney disease may genuinely need a controlled-protein therapeutic diet, but that is a decision for your vet, not a default for every grey muzzle.
"Senior" is not actually a standard
Here is what surprises people. Unlike "puppy/growth" and "adult", there is no separate, defined nutrient profile for "senior" in the main UK and European or US standards. That means "senior" on a label is a marketing description, and two senior foods can be formulated quite differently. So do not buy the word, read the recipe: check the protein level, that it is complete, and what is actually in it, using how to read a dog food label.
Calories down, weight watched
What usually does change is energy needs. Many older dogs are less active and burn fewer calories, so they can gain weight on the same portion that kept them trim when younger. Since extra weight is hard on ageing joints, adjust the amount down to keep them lean, and keep using the body-condition check from how much to feed. Lean still wins in old age.
The other real changes
A few things genuinely shift with age and are worth watching: dental wear or sore gums can make eating uncomfortable, so softening food with a little warm water can help; appetite can change, and a sudden drop is a reason to see your vet rather than just to switch food; and stiff, arthritic joints are common, where omega-3 can play a supporting role, covered in omega-3, salmon oil and joints.
SMPL is a complete diet for adult dogs that is well suited to healthy seniors: good levels of quality protein to help hold muscle, and because it is calorie-dense it is easy to feed in smaller portions as their energy needs fall. If your older dog has a diagnosed condition, such as kidney disease, follow your vet's dietary advice first, and use the principles here for a healthy, ageing dog.
