Why We Don’t Usually Add Beans to Dog Food

Beans—such as lentils, chickpeas, black beans, kidney beans, and pinto beans—may seem like a wholesome, plant-based protein source. After all, they’re fiber-rich and loaded with minerals. But for dogs, they’re not ideal for several reasons:

Dogs are not herbivores. While they can digest small amounts of legumes, their digestive systems are designed for high-protein, low-carb animal-based diets.
Beans are incomplete proteins. They lack one or more of the essential amino acids dogs need—unlike meat, which is a complete and highly bioavailable protein.
Beans contain antinutrients like lectins and phytates, which can interfere with the absorption of minerals and damage the gut lining in sensitive dogs.
Gas and bloating are common side effects—especially in dogs with sensitive digestion or inflammatory conditions like IBD, IBS, or leaky gut.

How Beans Impact Your Recipe Template

Our basic meal structure is:

75% muscle meat
10% organ meat
10% vegetables
5% bone or calcium

When you add beans, that changes the math:

Beans lower the overall percentage of animal protein, which dilutes essential amino acids—especially methionine, cysteine, and taurine precursors.
To make room for beans, pet parents often reduce the meat content. This may drop animal protein below 65% of the total diet, which is not recommended unless under clinical direction.

In general, 1 cup of cooked beans provides around 13 to 18 grams of protein, depending on the type. Here's a quick breakdown:

Black beans: ~15g protein per 1 cup (cooked)
Kidney beans: ~13g
Chickpeas (garbanzo beans): ~14.5g
Lentils: ~18g
Pinto beans: ~15g
Navy beans: ~15g

However, this protein is not as bioavailable to dogs as animal protein, and it lacks some essential amino acids (like methionine and tryptophan) required for building and repairing body tissues.

For comparison, 1 cup of cooked ground turkey or beef can have 35–40g of complete, highly bioavailable protein.

So even if beans look similar in numbers, they do not function the same in the body—and should not be used as a 1:1 protein substitute in canine nutrition.

Taurine: A Key Risk Factor

Taurine is an essential amino acid-like compound critical for:

Heart health
Vision
Neurological function
Bile production (digestion of fats)

Dogs can synthesize taurine from methionine and cysteine—but only when their diet provides enough of these sulfur-containing amino acids.

Problem: Beans don’t contain taurine, and they’re low in methionine and cysteine. Replacing too much animal protein with beans could block or reduce taurine synthesis, especially if the dog already has:

A predisposition to taurine-deficiency-related heart issues (e.g., in Goldens, Cockers, Newfs, Dobies)
A low-methionine diet
An overly processed or plant-heavy meal plan

Even worse, some legumes appear to bind taurine in the gut, interfering with its reabsorption and increasing risk of deficiency—this is one reason legumes came under scrutiny during the FDA’s dilated cardiomyopathy (DCM) investigation.

Bottom Line:

While small amounts of properly prepared beans may be tolerated by some dogs, they are not a preferred ingredient in most recipes we recommend.

If you’re looking to boost fiber or add a plant-based touch, vegetables like pumpkin, leafy greens, or zucchini are more gut-friendly choices that won’t interfere with taurine levels.

"Statements in this blog have not been evaluated by the FDA. Educational content only. Not intended to diagnose, treat, cure, or prevent any disease."