Senior Dog Food: The Complete Diet Guide for Older Dogs

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Every dog has different nutritional needs, and senior dogs are no exception. Once your beloved pup reaches his golden years, it can be even tougher to understand his shifting dietary requirements. This can often leave pet parents with a lot of questions: Is "senior dog food" necessary? What is the best senior dog food on the market? What do you do if your senior dog refuses to eat?

We sat down with Dr. Justin Shmalberg, a DVM and NomNomNow's veterinary nutritionist, to get the answers. 

At What Age Is a Dog Considered a Senior?

It turns out there's no medically agreed upon definition of what is considered a senior dog. Every dog is different, but size and weight are major factors. Generally, dogs that grow to a giant size (think Great Danes) have a shorter life expectancy, and we deem them senior at an earlier age, around 5 or 6. Small breeds (like Beagles) tend to live longer and may not be seniors until age 8 or 9.

Still, many dogs are very healthy even when they reach these age ranges. "In the future, genetic testing might tell us more about how and when the 'senior' period begins," says Shmalberg. Until then, vets might broadly consider any pet that has begun to show signs of aging "senior."

Signs of aging in dogs include:

It is important to distinguish, too, between "aging" and "geriatric." When you hear vets talking about geriatric dogs, they are usually referring to those toward the end of the senior period. Most will show some signs of aging like the above, and perhaps a few more severe symptoms, including:

As your dog crosses into his golden years, keep an eye out for these signs, and remember to take him for regular checkups. Most vets recommend twice yearly visits for senior dogs so they can do a thorough physical exam and blood work to help detect changes in organ function or other internal issues. They can also make recommendations when it comes to senior dogs and nutrition and evaluate which symptoms and signs may benefit from a change in diet.

What Are the Differences Between Senior Dog Food vs. Regular?

Is there a difference between senior dog food, regular adult dog food, and food labeled "all life stages" or "multi-stage"? Not necessarily. In fact, some food products might be identical and only market differently; that is, only the packaging changes. "There's no regulation of dog foods claiming to cater to seniors, which is why there's so much confusion on the topic," says Shmalberg.

There certainly are, however, some dietary factors that can help manage the physical and medical changes dogs experience as they age. Here are some of the ways a senior dog diet might differ from a regular adult dog diet:

Nutrient Adjustments

While some dogs may not need a change in the nutrient composition of their diet as they age, there are nutritional adjustments that may specifically benefit senior dogs, depending on a number of factors (e.g. their activity level or underlying medical conditions). Here are some of the most common:

* For weight gain: More than 450 calories per cup for kibble, or a higher-fat diet with more than 50 grams of fat per 1,000 calories.

* For weight loss: Less than 350 calories per cup for kibble, or a diet with portions premeasured for your dog.

Lower-calorie foods are often the way to go, because senior dogs tend to be less active than their younger counterparts. In fact, dogs' activity levels tend to drop by as much as one-third to one-half as they age; that means they do not need to take in as many calories. Portion control is key! That said, for those senior dogs who are losing muscle mass, a vet might recommend a diet higher in protein and calories.

Finally, always consult your vet, who can help you determine what is right for your dog and make adjustments accordingly.

Check out this study for more reading on senior dog nutrition. Remember, there is currently no senior, geriatric, or mature dog food nutrient profile recognized by the Association of American Feed Control Officials (AAFCO). That means there is no guarantee that senior food will contain a certain amount of protein, fiber, or any of the nutrients mentioned here.

Higher digestibility

Dogs' guts do undergo changes as they age, but how those changes impact they way they digest critical nutrients is still being studied. One 2005 study suggests that, despite shifts that happen in a dog's intestines, colon, and bacterial microbiome over time, aging alone does not decrease a dog's ability to digest nutrients. What is more likely is that senior dogs are more susceptible to digestion-related conditions (like a food allergy, inflammatory bowel disease, colitis, or pancreatitis) that could require specific dietary changes.

Still, the best diet for a dog that is aging, with or without medical conditions, is usually one that is tailored to that dog. You should see a range of modifications to senior dog foods that try to target digestion-related changes, from added soluble fiber (to function as a prebiotic, or food for the bacterial microbiome) to increased fat (to make the food more dense calorically or to aid in digestion). These adjustments may not be right, or even necessary, for most dogs. Bottom line: every dog digests foods differently, no matter their age. If your senior pet does not seem to be taking to a particular food, it may be time to try something different.

Talk to your vet for recommendations, and consider fresh foods, which are easier for the body to break down and pull nutrients from than some processed kibble or uncooked diets.

Soft texture and/or formulated to fight dental disease

If your dog is between dental cleanings or has lost a number of teeth due to dental disease, there is one simple change that may help him come mealtime: switching to a soft food (e.g. canned, raw, or fresh). Breaking through kibble can be tough for senior dogs, who are more likely to have loose or infected teeth.

In fact, many dog food products out there marketed or labeled specifically for dental disease are just regular foods with more moisture added. Of course, some do have ingredients meant to combat oral problems, including:

Keep in mind that the best treatment for infected gums or teeth is a cleaning and proper care from a vet.

Added joint supplements

Dogs are more likely to develop arthritis as they age, especially if they are overweight or obese. Supplementing with glucosamine and chondroitin, both precursors for cartilage, may reduce the symptoms of arthritis in dogs after a few months according to some studies. Research offers even more definitive evidence for the omega-3 fatty acids EPA and DHA, both of which have been shown to reduce inflammation in the joints and the symptoms of arthritis (like difficulty getting up, soreness, and lameness).

Unfortunately, many diets marketed for seniors advertising glucosamine, chondroitin, EPA, and DHA do not contain effective amounts of these substances. To get results, you may need to add them to your dog's food unless it is one specifically labeled for joint health.

Added MCTs, DHA, and antioxidants

Dogs, like humans, may show changes in memory and the ability to learn as they age. Several studies suggest that the following substances and nutrients may help to reduce some of the effects of these changes and are therefore added to some foods marketed to senior dogs:

What Is the Best Senior Dog Food?

When it comes down to it, there is no one best senior dog food. It is important to evaluate your own dog before making adjustments to his diet because every dog (especially an older one) needs a different nutritional strategy. Just because your dog is a senior does not mean he needs senior food.

"Many 'adult' or 'all life stages' foods may be as or even more beneficial than diets marketed for seniors," says Shmalberg.

Questions to Ask Yourself When Choosing a Senior Dog Diet

To get a sense of what your dog needs in his diet, ask yourself the following questions to determine which dietary adjustments might help. As always, consult your vet for further guidance on addressing these conditions through diet, supplements, and other lifestyle changes.

Does my dog show signs of muscle loss?

A food higher in protein might help; the usual recommendation for senior pets is more than 75 grams of protein per 1,000 calories.

Has my dog's appetite diminished?

If your vet has ruled out an underlying medical issue, your dog might find a diet higher in protein or fat more palatable. The same goes for diets with more moisture, like fresh food.

Is my dog just eating less than usual?

Senior dogs sometimes do not eat as much as they used to. If that is your dog, a food with higher amounts of vitamins and minerals is a good idea. This information is not always listed on product labels, but foods marked "all life stages" will often have more vitamins and minerals than adult foods.

Does my dog have osteoarthritis?

Look for a diet with elevated levels of the omega-3 fatty acids EPA and DHA (more than 1 gram of combined EPA and DHA per 1,000 calories). You can also supplement with glucosamine and chondroitin, two components of cartilage that are good for joints. Some foods have glucosamine and chondroitin added, but it is usually not enough to make a difference.

Is my dog showing signs of behavioral changes or memory loss?

Talk to your vet about a comprehensive strategy for reducing these effects of aging. A diet with more medium-chain triglycerides (MCTs), fish oil, and/or antioxidants may be helpful. Extra DHA may be particularly important, too.

Does my dog have kidney disease or another chronic disease?  

A special kidney-targeted diet with reduced levels of phosphorus may be in order.

Has my dog been constipated?

Look for a food with extra fiber in the form of psyllium or higher-fiber veggies like broccoli or green beans.

Is my dog showing signs of gastrointestinal upset, like diarrhea?

A prebiotic fiber like FOS, derived from chicory root, may help to normalize the bacteria in his gut. Because crude fiber on product labels only describes insoluble fiber, the type that adds bulk to the stool, you need to look more closely at the label for soluble, or prebiotic, fibers (e.g. fructooligosaccharides, chicory root, inulin, and fruit pectins).

Does my dog have a history of chronic pancreatitis?

A lower-fat diet may help. Otherwise, most healthy senior dogs do quite well on high-fat diets, as long as you control the portions.

Is my dog drinking less water than usual?

Some senior dogs do not drink enough water due to kidney disease or behavioral changes. In these cases, foods higher in moisture (liked canned or fresh) can help them get the extra hydration they need.

Ingredients That May Be Problematic for Senior Dogs

Finding the best dog food for senior dogs involves looking for certain beneficial ingredients while also avoiding those that could pose problems. Here are two to keep in mind:

Certain grains: There is no evidence grains are harmful to senior dogs, but some grains may be less digestible than other plant-based proteins and carbohydrates. Some dogs may find diets high in grains and low in animal proteins less palatable, too.

Grain-free proteins: As always, there is a flipside. Interestingly, newer research shows an emerging association between low levels of blood taurine, a nutrient important for heart function, and grain-free diets that are high in legumes (like peas, lentils, and chickpeas). It may be because these grain-free protein sources are less digestible. If your dog has heart disease, ask your vet about what is currently known about this association.   

What Is the Best Senior Dog Food for Small Breeds?


Though you may often see breed-based foods on pet store shelves, they are usually a function of marketing. It is not really critical to pick a "small breed" food for senior dogs; what they need nutritionally really does not differ all that much from what larger breeds need. However, if your friend eats kibble, it is good to choose one that is scaled down to a more appropriate size and shape for him.

Here are a few other recommendations to help you find the best senior dog food for small breeds:

What Is the Best Senior Dog Food for Large Breeds?

Large breed adult or senior dogs, unlike large breed puppies (who need more carefully controlled calcium levels than smaller breeds), don't necessarily need special dietary considerations. (Too much calcium is a concern only during the growth stage when bones are forming.) Large breeds can often keep on eating any adult or all life stages food that meets their needs.

Here are a few other recommendations to help you find the best senior dog food for large breeds:

What to Feed an Old Dog That Will Not Eat

Has your senior dog stopped eating? Do not stress too much; as they age, dogs tend to become less active and eat less to maintain their weight. Cognitive changes could impact a senior dog's eating schedule or frequency, too. For a dog who is still in good shape, this is not a huge concern, but there are a few steps you can take:

For more advice on what to feed an old dog that will not eat, and how to put weight on an old dog who is losing pounds, check out this guide.


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