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what to do if dog ate small piece of onion
what to do if dog ate small piece of onion

Who doesn’t like dogs? They are lovely and loyal pets that make our life more adorable, but you have to be careful what you are feeding them as we know that dogs can’t have some foods like onions, and today we gonna find out what to do if dog ate small piece of onion.

Is onion toxic to dogs?

Yes. The n-propyl disulfide is a poison that is found in onions. This chemical breaks down the red blood cells in dogs, which leads to anemia.

The toxin attaches to the oxygen molecules in your dog’s red blood cells and does damage to them that way. This makes it harder for the red blood cells to transport oxygen and makes your dog’s body think that the blood cell is an invader.

Hemolysis is the process by which red blood cells are broken down, which leads to hemolytic anemia.

Onion toxic parts

onion can be very toxic to dogs
onion can be very toxic to dogs

All parts of the onion plant, including the flesh, leaves, juice, and powders made from them, are dangerous for dogs. Garlic, shallots, leeks, and chives, which are also in the allium family, are also bad for dogs, whether they are raw, cooked, fried, or ground into a powder.

A surprising number of foods, from soups to baby food, contain onion powder. 100 grams of onion (about the size of a medium onion) per 20 kilograms of dog weight is all it takes to make a dog sick

This means that a 45-pound dog would only have to eat one medium-to-large onion to get sick. Since most dogs would gladly eat a bag of onion rings or a casserole made with onions if they were left alone, this is a serious problem.
Garlic powder and onion powder are even stronger than fresh onions. Check the label before feeding your dog any human food, and onion powder should be on your list of “don’ts.”

As a warning to people who live with more than one kind of animal, onions are even more dangerous for cats than for dogs, so keep both cats and dogs away from onion treats.

Types of onion toxicity

  • Instant toxicity:

The most common type of instant poisoning happens when your dog eats more than 0.5% of its body weight in onions.

If your dog has an “instant” reaction, you’ll see signs of onion poisoning soon after they eat an onion. However, it could take up to 72 hours.

  • Delayed poisoning:

Another kind of onion poisoning happens when your dog eats onions over several days and N-propyl disulfide builds up in its body.

The toxin will then build up in their system, showing its ugly face when it starts to affect your dog’s red blood cells.

Dogs’ onion toxicity symptoms

dogs onion toxicity symptoms
dogs onion toxicity symptoms

Here are some symptoms to know if your dog got onion poisoned:


Dogs can be tired for a number of reasons, including anxiety, fear, infections, cancer, and other health problems. If your dog is lethargic, you might also notice that it moves slowly and doesn’t want to play.


It’s normal for a dog to be tired after a hard workout or on a hot day, but if your dog’s energy stays low after a rest, or if there doesn’t seem to be any reason for it, you should take your dog to the vet right away.

Decreased appetite

Even though a dog’s loss of appetite doesn’t always mean they are sick, it is important to get them to the vet right away because it could be a sign of something serious like cancer, pain, liver problems, or kidney failure.

Reddish urine

If you see blood in your dog’s urine or if they act like they are in pain or having trouble going to the bathroom, take them to the vet or to an emergency vet if they need help right away. If they see blood, they should see a doctor within 24 hours.

If your dog has any of these signs, the best thing to do is to take them to the vet as soon as possible. The symptoms and blood work will help your vet figure out what’s wrong with your dog.

If your vet finds hemolytic anemia or Heinz bodies on a blood smear and you’ve been eating onions recently, all signs point to onion toxicity.

What to do if dog ate small piece of onion?


As susceptibility varies, all dogs who eat onion must be made to throw up, so if you notice that your dog has eaten a small or a big piece of onion, just make him vomit instantly to avoid the toxic effects.

Keep onions away:

the best thing you can do is to keep the onion and your dog away from each other.

Take your dog to a vet:

if you couldn’t force your dog to vomit if he ate a big piece of onion, you better take him to the closest veterinary.

Onion poisoning treatment

Dogs onion poisson treatment
Dogs onion Poison treatment

If a dog has eaten onion in the last hour, all you have to do is make it throw up. After this time, some are likely to have been taken in.

If so, you might still want to throw up and then take some activated charcoal. But there is no way to stop the poison from getting into the bloodstream.

The blood of these dogs needs to be checked every day. Some people will need extra oxygen or blood transfusions, but the good news is that most people will get better without any problems.

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