Your dog takes a few extra seconds to stand up after a nap, or hangs back on the walk, and the bag at the store says "7+" or "Senior". The age on the bag is a guess. Whether your dog needs a different food depends on how your dog is doing, and most of this guide is about how to tell.

Is my dog a senior yet?

Veterinary guidelines do not give an age. The American Animal Hospital Association's senior care guidelines say there is no specific age for senior status because dogs age so differently by breed and species, and they keep the definition from the 2019 edition: the last quarter of a dog's expected lifespan. A Great Dane reaches that years before a Chihuahua does. Tufts' veterinary nutrition service says turning seven, or ten, or fifteen does not make a dog biologically old.

The signs worth watching are on our senior dog food page. Bloodwork comes first: the AAHA guidelines recommend a medical workup for senior pets once or twice a year, which may include a blood count, blood chemistry and a urinalysis, and that is where a change in appetite or weight gets explained. If your dog is healthy, holding condition and eating a balanced food, Tufts says there is no reason to change anything.

What "senior" means on a bag

The word has no legal meaning. AAFCO, the body whose nutrient profiles pet food labels are written to, recognizes four life stages: gestation and lactation, growth, maintenance, and all life stages. There is no senior profile. Tufts notes that a food marketed for seniors has to meet the same rules as any adult food, and that adult dogs are treated as one group whether they are two or fifteen.

That is why two senior bags can go in opposite directions. Tufts notes that commercial senior diets vary widely in protein, phosphorus, sodium, calories and fiber. Sodium alone ranged from 33 to 412 milligrams per 100 calories across the foods it looked at. One company's senior food can have fewer calories per cup than your current food and another's more. The calorie line on the back tells you which kind you are holding.

Do older dogs need less protein?

The common belief, in Tufts' words, is that they do. Tufts says reduced protein is not beneficial for the healthy older dog and may work against the dog by contributing to muscle loss. Cornell's canine health center goes a step further. It likes to see slightly higher protein as dogs age, and it notes that many commercial senior foods do not deliver it.

Protein is what maintains muscle, and Tufts is clear about the limit: the ideal protein level for an older dog is still debated. For a healthy dog that leaves no reason to cut protein. If your dog has kidney disease, that is a different conversation and your vet sets the number.

Calories and weight

Older dogs are usually less active, so they need fewer calories and gain weight easily. Cornell's advice is to weigh your dog regularly, because the gain is slow, and to cut portions when it starts. Some older dogs go the other way and lose weight. Cornell notes that overweight and underweight dogs can both be short on muscle, and weight that drops without a change in portions is a reason for the vet visit above before you change the food.

Joints and omega-3

Fish oil shows up in many senior foods, and Cornell says the long-chain omega-3s in it, EPA and DHA, may help dogs with arthritis. Cornell's guidance for a dog with arthritis works out to roughly 300 milligrams of EPA and DHA per ten pounds of body weight a day, which it calls a high dose. A food that lists fish oil near the bottom of its ingredients is unlikely to reach that amount. If stiffness is why you are shopping, start with our dog food for joint health page and ask the vet about dose.

Food for an aging brain

Some older dogs show signs of cognitive decline, and Tufts describes the diets built for this. They bundle fish oil, B vitamins, arginine, antioxidants including vitamins E and C, and medium-chain triglycerides, a type of fat the brain can use for energy. One study found a lasting improvement in older dogs from the medium-chain triglycerides. Most studies changed several nutrients at once, so nobody can say which one does the work.

These diets do not reverse cognitive decline; Tufts says the aim is a better quality of life. And Tufts cautions that adding a supplement on top of a regular food will not necessarily give the same result as one of these diets.

How to read a senior label

Five lines on the back of the bag answer most of the questions above.

  • Protein. Read the guaranteed analysis and compare the percentage with the food you feed now. For a healthy older dog you want the same or a little more.
  • Calories. Find the kcal per cup line, usually in small type near the feeding chart, and compare that too. This is how you find out whether a "senior" food is a diet food or the opposite.
  • Phosphorus and sodium. Tufts found both vary widely across senior foods. If your dog has a kidney or heart condition, these are the numbers the vet will want to see, and not every bag prints them.
  • The adequacy statement. Look for "adult maintenance" or "all life stages". That is the standard the food met.
  • Fish oil. The ingredient list shows whether fish oil is included but not how much. For joint help, ask the vet about dose.

Switching foods

Go slowly. The usual advice is to mix old and new over a week to ten days and to slow down if stools loosen. An older dog that stops eating for more than a day or so during a switch should see the vet.

Comparing senior foods

Our senior dog food list is filtered to foods flagged for senior care; use the five label checks above on any bag you pull from it, since the list does not read the guaranteed analysis for you. See the vet before changing food if anything about your dog's eating, drinking, weight or behavior has changed; those need bloodwork first.

Best Senior Dog Food screens every food in our database against its criteria, so you can compare ingredients, allergy risk and price side by side.

Sources