Are Dogs Allergic to Peanut Butter?

Most dogs love peanut butter, and most can eat it. True peanut allergy in dogs is uncommon, and we did not find a primary source that gives how common it is, so we give no figure.

The real danger is xylitol. The American Kennel Club says: “Most peanut butter is safe for dogs, but some can be deadly.” Some brands use xylitol, a sugar substitute that is safe for people but toxic to dogs.

After xylitol, the next concern is fat. Peanut butter is rich, so too much can cause weight gain and stomach upset.

This page covers what to check on the label, how much is sensible, the signs of an allergy or a bad reaction, and when to call your vet. It is general information, not veterinary advice.

Is peanut butter safe for dogs?

The American Kennel Club says most peanut butter is safe for dogs in moderation, and can be a source of protein, healthy fats, vitamins B and E, and niacin. It names unsalted peanut butter, dog-specific peanut butter and homemade peanut butter as the healthiest options, because high sodium levels can be a problem for dogs.

The xylitol warning

The American Kennel Club explains that xylitol is found in sugar-free products such as chewing gum, toothpaste, breath mints, chewable vitamins and baked goods. It says xylitol causes a rapid release of insulin in dogs, which leads to a profound drop in blood sugar, and that this can happen as quickly as 10 to 60 minutes after eating it.

Xylitol is a poisoning, not an allergy. Any dog can be affected, so read the ingredients on every jar, and keep xylitol products out of reach.

• Check the label of the peanut butter, and of any other food you plan to share.
• Look for “xylitol” in the ingredient list. Some labels may use other names, so if you are unsure, choose another product.
• If you think your dog has eaten xylitol, call your vet immediately. The AKC lists weakness, collapse, staggering, lack of coordination and seizures as signs to watch for.

How much peanut butter can a dog have?

The American Kennel Club says peanut butter is rich in natural fats and protein, and too much can lead to obesity and other problems such as pancreatitis. Its advice: ask your vet, which matters most for dogs with diabetes or food sensitivities, and keep treats to no more than 10 percent of the daily diet.

Earlier versions of this page gave a serving per body weight in pounds. We could not trace it to a primary source, so we removed it. Measure your dog’s daily food, then ask your vet what share a treat can take. Related: best dog treats and peanut butter treats.

Can dogs be allergic to peanuts?

Yes, any food can cause an allergy, and peanuts are one of many possible triggers. But we found no primary source that says how often it happens in dogs, so we do not give numbers. Your vet is the one to confirm or rule out a food allergy.

Signs to watch for

After your dog tries any new food, watch for changes. Contact your vet if you see any of these:

• Itchy skin, red skin or hives, or a dog that keeps licking its paws (see why dogs lick their paws).
• Vomiting or diarrhoea (see bland food for dogs with diarrhoea).
• Swollen face, trouble breathing or collapse: this is an emergency. Go to a vet immediately.

How a vet works out a food allergy

Do not guess at home. Your vet may suggest a controlled elimination diet, where your dog eats only a limited food for a set time and new foods are added back one at a time. Ask your vet which tests, if any, suit your dog. See also best dog food for sensitive skin.

Sensible ways to feed peanut butter

1. Read the label every time, and avoid xylitol.
2. Choose unsalted, dog-specific or homemade peanut butter.
3. Start with a tiny amount and watch your dog for the next day.
4. Keep it a treat, within the 10 percent limit.
5. Check with your vet first if your dog has diabetes, pancreatitis or a food allergy.

The bottom line

Peanut butter is fine for most dogs when it has no xylitol and is fed in small amounts. If your dog reacts, stop and talk to your vet.