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A low protein diet is recommended by a veterinarian only in very special cases, such as for dogs with kidney disease or failure, liver disease or failure, and, temporarily, for dogs with bladder stones.

It would be best if you never switched to a low protein dog food brand without consulting with a vet beforehand.

A diet low in protein needs to be carefully designed and monitored because there's a risk for several side effects.

When your pet is diagnosed with a health issue that requires lower protein intake, you will have three options for this dietary change:

  1. Prescription dog food for kidney and liver health (very expensive)
  2. Low protein homemade dog food diet (cheaper but still expensive)
  3. Regular store-bought dog food that's lower in protein (most affordable)

The best low-protein dog food is likely to be a prescription brand. Unfortunately, these are harder to find and are about twice as expensive as regular foods.

However, you can save money by searching among regular dog food brands with a lower crude protein basis (listed under “dry matter basis”).

It will be trickier to pick among them, but once you find the right one, you can stick with it indefinitely.

Below are some of the best low protein dog food brands in different price ranges:

When Do You Need to Switch to a Low Protein Dog Food Brand?

Studies have shown that decreasing protein intake in a diseased dog's diet makes them more active, less lethargic and increases survival times among terminally ill pets (1).

This is because kidneys and liver are already overworked, and the less protein these organs need to process, the better they will function (2).

In kidney and liver problems, switching to a new low protein diet will be permanent.

Make sure when you're picking the best low protein dog food for your pet that it's something they enjoy and can live with for the rest of their life.

In bladder stones, the dietary change is temporary, and you can switch back to regular food after urinary stones have been eliminated.

Paradoxically, studies also show that decreasing the amount of protein in an ill dog's diet actually provides more protein-rich nutrition (3).

This is because kidneys are not overworked, and they lose less protein through urination, thereby having more of it available for the dog's body to utilize (4).

Most common health issues that may require you to switch to low protein dog foods include:

  • Urinary stones (Uroliths, UTI)
  • Chronic kidney disease
  • Inflammation of the kidneys (Glomerulonephritis)
  • Lyme-disease associated with kidney inflammation
  • A liver shunt (portosystemic shunt)
  • Hepatic encephalopathy (associated with cirrhosis of the liver)

Are There Any Side Effects from Switching to Low Protein Dog Foods?

Yes. Because protein is one of the essential macronutrients in a dog's diet, decreasing its intake may have side effects.

This is why you should never switch to this type of diet of your own accord and should consult with a veterinarian beforehand.

Choosing the best low protein dog food brand will depend on your individual dog and their special circumstances, all of which will be evaluated by a vet.

Low protein diets have been shown to cause muscle loss and weight loss in dogs and weaken their immune system (5).

Unfortunately, when your dog has a chronic kidney or liver disease, and it's between those side effects or kidney/liver failure, you have to compromise in the interest of increasing your pet's lifespan.

That said, a veterinarian or canine nutritionist will design your individual dog's diet with extreme precision to minimize or potentially even prevent any side effects after a switch to a low protein diet.

The Best Low Protein Dog Food Brands

1Diamond Naturals Light Real Meat Premium Dry Dog Food

Diamond Pet is probably the only low protein dog food option in a fairly affordable range.

They have a wide range of dog food recipes that are specially formulated for various life stages and conditions, with this one being the closest recipe to prescription dog foods for kidney/liver health.

Diamond Pet Foods Naturals Lite - Lamb & Rice - 30...
1,348 Reviews
Diamond Pet Foods Naturals Lite - Lamb & Rice - 30...
  • HIGH quality PROTEIN made with...
  • Premium ingredients with added...
  • Nutrient rich and HIGHLY...
  • FAMILY OWNED & run, MADE in...
  • NO corn, wheat, filler; NO...

It's similar to many weight management formulas designed for older and less active dogs to support healthy weight with all-natural, premium ingredients, active probiotics, and digestive enzymes.

Their main protein source is pasture-raised lamb, which can also benefit dogs with allergies to beef and chicken.

Among “regular” dog food brands, this would be considered premium dog food.

Other than potentially being one of the best low protein dog food brands with an affordable price tag, many pet owners have also reported its high palatability and having even picky dogs enjoy this recipe.

PROS:

  • Most affordable among this range of brands
  • Pasture-raised lamb as the main protein source
  • A family-run company with a great reputation
  • Digestive health support system, featuring active probiotics, healthy fiber, and digestive enzymes
  • Contains no meat or poultry by-products, wheat or wheat gluten, artificial flavors, colors, or preservatives, and no fillers
CONS:

  • Will not fit every dog's with kidney/liver issues requirements

 

2Veterinary Diets Purina Veterinary Canine NF Kidney Function

A prescription-like dog food brand, Purina's Veterinary Diets are well-designed for specific health conditions, including kidney, liver, and bladder stones problems.

Your vet will likely approve this formula in particular if you choose to avoid more expensive prescription dog foods.

However, while it theoretically meets the needs of diseases dogs, many pet owners find that their canines refuse to eat this.

Purina Pro Plan Veterinary Diets NF Kidney...
77 Reviews
Purina Pro Plan Veterinary Diets NF Kidney...
  • (1) 6 pounds bag - Purina pro...
  • Restricted amount of...
  • Restricted phosphorus to...
  • Reduced sodium
  • Energy-dense for needed...

The recipe is low in protein and phosphorus and therapeutically designed for kidney health, with an added source of omega-3s.

The ingredients are mainly sourced within the US and Canada, with some ingredients sourced from New Zealand.

As with most prescription-like dog foods, this is an expensive choice, but it's cheaper than buying something from a veterinary clinic.

Among the other best low protein dog food brands that are prescription-based, Purina Veterinary Diets is more affordable (compared to Royal Canin, for example).

PROS:

  • Less expensive than other prescription diets
  • Therapeutic and precisely formulated for dogs with kidney problems
  • Made in the U.S.A.
  • Available in dry and canned formulas
CONS:

  • Among prescription-like foods, this one only ranks about average.

 

3Royal Canin Canine Renal Support S Dry

One of the most expensive low protein dog food brands on the list is that your veterinarian is very likely to recommend.

If your wallet can afford the high price tag, Royal Canin would be considered the number one among the best low protein dog food brands.

The reason it's ranked lower is that there are similar options at a slightly cheaper cost.

ROYAL CANIN Canine Renal Support S Dry (17.6 lb)
140 Reviews
ROYAL CANIN Canine Renal Support S Dry (17.6 lb)
  • New formulation with enhanced...
  • Enriched with EPA and DHA to...
  • Highly digestible with low...
  • Manages early stages of...
  • Enriched with long chain...

Royal Canin is well-known for its therapeutic diets (similar to Hill's Science).

They're more popular in the EU than they are in the U.S. Their previous versions were disregarded by pet owners because dogs refused to eat those recipes; however, the new formulation is much better.

While they maintained the formula to accommodate dogs with renal disease, they've improved the taste and aroma.

Pet owners are reporting that even picky dogs respond well to this food.

PROS:

  • Highly rated brand with a proven track record
  • Scientifically designed for dogs with renal issues
  • New formulation with a better taste and aroma that works even with picky eaters
  • Highly digestible, with added omega-3s
CONS:

  • Very expensive

 

4Hill's Science Diet Dry Dog Food, Adult 7+ for Senior Dogs

Here's another well-known brand that specializes in prescription dog foods. This Hill's Science formula is low in phosphorus, contains less protein and sodium, and is high in omega 6 fatty acids and vitamin E complex.

Like with Royal Canin and Purina formulations, this combination reduces the workload on kidneys, keeping them functioning optimally considering their impairment; it assists other bodily functions to aid the kidney and compensate for other nutrients that these dogs are deprived of.

Hill's Science Diet Dry Dog Food, Adult 7+ for...
2,767 Reviews
Hill's Science Diet Dry Dog Food, Adult 7+ for...
  • This dry dog food provides...
  • Uses a balanced set of...
  • This dry dog food provides...
  • High-quality protein help...
  • Made in the USA with global...

This is another one of the best low protein dog food brands that you can buy either as dry kibble or 12-13 ounce cans.

Hill's Science is the most vet-recommended dog food company because they spend large amounts of cash designing their recipes based on current scientific research.

Despite the flak they get from some pet owners, the fact remains that it remains one of the best low protein dog food brands out for scientifically most appropriate foods for dogs with kidney, liver, heart, and bladder issues there.

PROS:

  • More affordable than many other prescription foods
  • Low in phosphorus, protein, and sodium
  • High in omega 6 fatty acids and vitamin E complex
  • Available at most veterinary offices
CONS:

  • Not the lowest amount of protein you can find among dog food brands
  • Still fairly expensive

 

5Blue Buffalo Natural Veterinary Diet Kidney Support for Dogs

The final one among the best low protein dog food brands is another prescription-like recipe from Blue Buffalo.

It's specifically designed by vets to be limited in phosphorus, sodium, and protein and assist with kidney and liver function.

Just like Purina and Royal Canin, this one might be more difficult to locate unless you purchase online (and if you do, make sure your veterinarian is aware of this).

Kidney Support for Dogs 22lbs
35 Reviews
Kidney Support for Dogs 22lbs
  • Controlled levels of protein...
  • Controlled levels of...
  • Antioxidants, L-carnitine, and...
  • Made without the grains many...
  • A wholesome, natural diet that...

Unlike some other listed best low protein dog food brands above, this one does not contain any grains (which could be either a good thing or a bad thing, depending on your individual pet).

Like others, on top of controlled protein levels, this recipe also includes antioxidants, omega-3s, and other ingredients in support of kidney, liver, and heart function.

Unfortunately, as it is common with veterinary diets, this one is also fairly expensive (though cheaper than Royal Canin)

PROS:

  • Cheaper than some other prescription foods
  • Specifically formulated for kidney health
  • Grain-free
  • Added ingredients to help kidney function
CONS:

  • Still very expensive

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Top Rated Best Low Protein Dog Food for Kidney and Liver Health