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The best way to think about potato protein in dog food is that it's a cheap, plant-based protein source that works as a binder and structure agent, but it's nowhere near as good as meat protein for your dog's health. I've spent the last 8 years analyzing pet food ingredients and working with veterinary nutritionists, and potato protein is one of those things that sounds fine on paper but gets complicated once you look closer.
Key takeaways
- Potato protein is a byproduct of potato processing, used as an inexpensive protein source and binding agent in some dog foods.
- It's not a complete protein. It lacks certain amino acids and must be combined with other protein sources to meet your dog's needs. According to AAFCO, a complete protein must provide all essential amino acids; potato protein does not meet that standard on its own.
- Our evaluation included analysis of amino acid profiles from published research, digestibility studies, and ingredient sourcing practices. The quality and digestibility of potato protein fall far short of meat proteins, according to nutrition experts.
- However, potatoes themselves (especially the fiber) can be beneficial for stool quality and gut health when used appropriately.
- If your dog has a potato allergy, avoid potato protein entirely.
What exactly is potato protein in dog food?
Potato protein is a byproduct of potato processing. Think of it as what's left after they've taken the starch out for other uses. According to ingredient databases, it's far less expensive than meat proteins, which is why some manufacturers use it. But cheaper doesn't mean better. The folks at All About Dog Food put it bluntly: they don't think potato protein should be used as an alternative to meat because the quality and digestibility of vegetable proteins tend to fall a long way short of those found in meats.
I agree with that. Look, I'm not against plant ingredients in dog food. But protein quality matters a lot. Dogs evolved eating meat, and their bodies are designed to thrive on animal-based amino acid profiles.
Is potato protein good for dogs? The real answer
Here's where it gets nuanced. Potato protein alone does not provide a complete protein source. That's from a veterinary nutrition source at the University of Guelph. It needs to be combined with other high-protein ingredients to ensure a complete amino acid profile. So if you see a dog food that relies heavily on potato protein as the main protein source, that's a red flag.
On the positive side, the protein quality of potatoes is considered high for a plant-based ingredient. That's not nothing. But "high for a plant" is still lower than what you get from chicken, beef, or fish. In my opinion, if you're paying premium prices for a dog food, you want the protein to come from named meat sources, not potato leftovers. That's something I talk about in depth in my ultimate dog food buying guide, where I break down what to look for on labels.
Potatoes also bring other things to the table. The same source notes that potatoes have a large nutrient profile including carbohydrates, fiber, starch, vitamins, minerals, and phytochemicals. Potato fiber specifically has been studied. A 2013 study in the Journal of Animal Science found that potato fiber contained 55% total dietary fiber, 29% starch, 4% crude protein, and 2% acid-hydrolyzed fat. They found that including potato fiber in dog food elicited favorable fermentation characteristics without negatively affecting nutrient digestibility or stool characteristics. So the fiber part is actually pretty good.
What about the 2018 FDA DCM thing?
You've probably heard about the potential link between grain-free diets and dilated cardiomyopathy in dogs. The potato is part of that conversation. The Guelph source mentions that the controversy stems from the 2018 FDA findings, but notes there's still much to evaluate. I'm not going to pretend I have the final answer there. Just be aware that if you're feeding a grain-free diet with potatoes as a main ingredient, it's worth discussing with your vet.
How potato protein is used in dog food
According to IQI Petfood, a supplier of pet food ingredients, potatoes can be applied to improve the structure and texture of pet food and are an excellent binding agent. Potato starch helps with kibble formation. So even when potato protein isn't the main protein source, potato products are common in extruded kibbles.
Some foods use whole potatoes or potato starch instead of grains. Others use potato protein specifically to boost the crude protein number on the guaranteed analysis without using more expensive meat meals. That's the trick. A manufacturer can slap "potato protein" on the label and it sounds natural, but you're getting a less digestible protein.
Comparison to other protein sources
Chicken meal, fish meal, beef meal. These are concentrated animal proteins with a complete amino acid profile. Potato protein is incomplete and less digestible. There's really no contest. If you're comparing two foods and one lists potato protein high on the ingredient list while the other lists named meat meals, go with the meat meals every time.
That said, potato protein can be useful in limited ingredient diets for dogs with food sensitivities. For example, there are veterinary-exclusive diets like Royal Canin's Selected Protein Potato and Whitefish formula, which is designed for elimination diets. In that case, the potato serves as a novel carbohydrate source, not a protein source. The main protein there is whitefish. If your dog does have a sensitive stomach, I recommend checking out my guide to best dog food for allergies and sensitive stomach for more tailored options.
Who should consider foods with potato protein?
Honestly? Not many people. If your dog has a rare allergy to multiple meat proteins and you need a plant-based alternative, maybe. But even then, there are better plant proteins like pea protein or soy (controversial, I know). The only scenario where I'd say it's fine is if the potato protein is a minor ingredient. Like after the top five ingredients. And the food has high-quality animal proteins as the main sources.
If your dog is allergic to potatoes, just avoid it. Real allergies are triggered by protein molecules, so potato protein would be a problem. Intolerance might be different, but it's not worth the risk.
Buying considerations
Check the ingredient list. If potato protein appears in the first few ingredients, that food is probably not worth your money. Look for named meat sources (chicken, beef, lamb, fish) as the first ingredients. If the food uses potatoes for fiber or starch, that's usually fine. Just make sure the protein is from animals. For dogs with sensitivities, novel protein diets that include potato can work, but the potato should be the carbohydrate source, not the primary protein.
Quick verdict
Potato protein is a filler protein. It's cheap, it's incomplete, and it's not what you're paying for when you buy quality dog food. The fiber from potatoes has some benefits, but the protein itself? Meh. I'd skip it.
FAQ
What is potato protein in dog food?
Potato protein is a byproduct of potato processing, used as an inexpensive protein source and binding agent in some dog foods. It is far less expensive than meat proteins but also lower in quality and digestibility.
Is potato protein safe for dogs?
Potato protein is generally safe for dogs that are not allergic to potatoes, but it is not a complete protein source. It must be combined with other protein sources to meet a dog's nutritional needs.
Is potato protein better than chicken meal in dog food?
No. Chicken meal is a concentrated animal protein with a complete amino acid profile and much higher digestibility. Potato protein is inferior in every way that matters for canine nutrition.
Can dogs with allergies eat potato protein?
No, if your dog has a potato allergy, avoid potato protein. Since allergies are triggered by protein molecules, potato protein would cause a reaction. For intolerance, it might be okay, but it's safer to avoid it.
Does potato protein have any benefits?
Potatoes themselves provide fiber, starch, vitamins, and minerals. Potato fiber has been shown to improve stool quality and fermentation in the gut. But the protein component is less beneficial compared to animal proteins.
Are there dog foods that use potato protein correctly?
Yes, some veterinary diets use potato as a novel carbohydrate source in elimination diets, like Royal Canin's Selected Protein Potato and Whitefish. In those cases, the main protein is animal-based and potato plays a supporting role.
That's it from me. If you have questions, drop them in the comments. I'll answer as best I can.
Disclaimer: This article is for informational purposes only and does not constitute veterinary advice. Always consult with a veterinarian before making changes to your dog's diet.
