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The Daily Insight

Are onions toxic to dogs?

Author

Christopher Snyder

Updated on March 14, 2026

What parts of onions are toxic to dogs? All parts of the onion plant are toxic to dogs, including the flesh, leaves, juice, and processed powders. Raw or cooked, fried or powdered, onions and the rest of the allium family (garlic, shallots, leeks, and chives) are harmful to dogs.

What happens if a dog eats onions?

Consuming onions can lead to dogs developing a condition called hemolytic anemia. This condition impacts/destroys a dog's red blood cells, leaving dogs without enough of them for healthy functioning. Severe onion poisoning in dogs can be fatal.

Will a tiny piece of onion hurt a dog?

Onions, garlic and other members of the allium family can be toxic to dogs. This is called allium species toxicosis, or onion toxicity.

How much onion powder is toxic to dogs?

Generally, dogs need to consume at least 5% of their body weight to develop onion toxicosis. This means that Bambi will have needed to consume about 50g of onion powder to show clinical signs off illness.

How do you treat a dog who ate onions?

If you see your dog eating onions or suspect that your dog has eaten them, your best course of action is to seek immediate veterinary care, especially if your dog seems like he isn't feeling well or is tired and weak. Your vet will evaluate your dog and take the proper course of action.

Garlic and Onion toxicity in dogs. What to expect and do if your dog eats garlic or onions

How long does it take for onion toxicity in dogs?

While vomiting and diarrhea may occur within one day, it may take several days to a week after your pet eats onions for symptoms of anemia to appear.

How much onion and garlic is toxic to dogs?

How Much Garlic or Onion is Toxic to Dogs? "Consumption of as little as 15 to 30 g/kg in dogs has resulted in clinically important hematologic changes,” says Hohenhaus.

Can dogs have beef broth with onions?

Many broths contain additional ingredients like onion and garlic, both of which can be toxic to dogs, says Dr. Deborah E. Linder, a board-certified veterinary nutritionist and research assistant professor of clinical nutrition at the Cummings School of Veterinary Medicine at Tufts University in Grafton, Massachusetts.

How long does it take to digest onions?

"It is not that onions take longer to digest, it's that they have compounds in them that can be difficult to digest," she says. On average, the entire digestive process takes about two to five days from the time you swallow to the time something leaves your body, according to the Mayo Clinic.

Can dogs eat bananas?

Yes, dogs can eat bananas. In moderation, bananas are a great low-calorie treat for dogs. They're high in potassium, vitamins, biotin, fiber, and copper. They are low in cholesterol and sodium, but because of their high sugar content, bananas should be given as a treat, not part of your dog's main diet.

Can dogs have gravy with onions in it?

No, dogs cannot eat gravy made for humans. Gravy—a topping consisting of meat drippings and a thickener—has high amounts of sodium and fat and ingredients that can be toxic to dogs, like garlic and onions. If your dog eats gravy, monitor them for signs of illness and consult a veterinarian.

Can dogs have carrots?

Raw and cooked carrots are healthy options for dogs and make a nutritious add-in to meals. While carrots are generally safe, it is important to cut whole carrots and even carrot sticks into bite-size chunks before feeding them to your dog. As a result, you will prevent choking, especially in small dogs.

Can dogs have tuna?

Can dogs eat tuna? The answer is no. You shouldn't feed your canine companion the saltwater fish because it could lead to a number of different health problems.

How long do onions last in the fridge?

Store cut onions in the refrigerator (or even the freezer)… You can hang on to a halved or sliced onion in an airtight container in the fridge for about one week. Store them in an airtight container (preferably a glass one, as plastic will absorb odor) to decrease oxidation, moisture absorption, and stinkiness.

How much is 2 medium onions chopped?

In our test, a medium onion yielded around 2 cups of diced onions, while a large onion yielded 3 cups of the same sized dice. Of course, your mileage may vary, and there are variables to consider.

How much frozen chopped onion is one onion?

Measure out as many as you need for your recipe, add them to your dish, and they'll thaw as they cook. One cup of chopped, frozen onions is the equivalent of one medium onion.

How do I know if my dog has onion poisoning?

Gastrointestinal upset commonly occurs, including signs of decreased appetite, vomiting, diarrhea, depression, abdominal pain, and drooling. Eating larger amounts may cause red blood cell damage resulting in weakness, elevated heart rate, increased respiratory rate and effort, panting, pale gums, or red-colored urine.

Is a little garlic OK for dogs?

Garlic, like other members of the Allium family, contain compounds called disulfides and thiosulphates which can be toxic cats and dogs if ingested. The ingestion of garlic causes conditions called hemolytic anemia, Heinz body anemia, and methemoglobinemia which are all manifestation of damage to red blood cells.

Can dogs have broccoli?

Dogs can eat both cooked and raw broccoli, as long as there are no seasonings or oils added. However, this vegetable should always be given in very small quantities, especially because the florets contain isothiocyanates, which can cause gastric irritation in dogs.

Can dogs eat cheese?

While cheese can be safe to feed to your dog, there are some things to remember. Cheese is high in fat, and feeding too much to your dog regularly can cause weight gain and lead to obesity. Even more problematic, it could lead to pancreatitis, a serious and potentially fatal illness in dogs.

Can a dog eat popcorn?

Plain, air-popped popcorn is safe for dogs to eat in small quantities. Buttered popcorn or popcorn with other toppings is not safe for your dog on a regular basis, although eating a few dropped pieces here and there probably won't hurt him.

Can dogs have eggs?

Eggs are perfectly safe for dogs, Eggs are a great source of nutrition for your canine companion. They are high in protein, fatty acids, vitamins, and fatty acids that help support your dog inside and out.

Can dogs eat potatoes?

Like tomatoes, raw potatoes contain solanine, a compound that is toxic to some dogs. However, cooking a potato reduces the levels of solanine. If you do feed your dog a potato, it should be baked or boiled, with nothing added to it.

Can dogs eat pork?

It is safe to eat pork, but there are certain conditions that must be adhered to if you plan to feed your dog the “other white meat.” Plain pork is safe for dogs to eat, as long as you keep it simple and leave off the bells and whistles people tend to cook with.