Why can’t dogs eat onions? What will happen if a dog eats onions by mistake?

Jul 26,2025
5Min

Reasons why dogs cannot eat onions

1. Foods such as onions contain irritating substances, which can irritate the dog’s gastrointestinal tract and cause inflammation. Onions contain a toxic ingredient called n-propyl disulfide. Whether cooked or raw, dogs ingest this substance, which causes hemoglobin to oxidize into Heinz bodies, red blood cells containing Heinz bodies. It is engulfed in large quantities by the reticuloendothelial system, causing acute hemolytic anemia and damaging the bone marrow.
2. Onions are food to humans, but poison to dogs. Acute poisoning usually occurs 1-2 days after eating. Obvious red urine appears, and the color of the urine varies from light red, dark red to dark red. In severe poisoning, the dog's urine will be brown or soy sauce color, the dog's appetite will be reduced, depression, palpitations, vomiting, diarrhea, if not treated in time, may lead to death. Chronic poisoning is more common in dogs that are fed a small amount of onions or onion juice for a long time, often showing mild anemia and jaundice.

Symptoms and diagnostic methods of dogs eating too much onions

1. Acute poisoning usually occurs 1-2 days after eating. Obvious red urine appears, and the color of the urine varies from light red, dark red to dark red. In severe poisoning, the dog's urine will be brown or soy sauce color, the dog's appetite will be reduced, depression, palpitations, vomiting, diarrhea, if not treated in time, may lead to death.
2. Chronic poisoning is more common in dogs that are fed a small amount of onions or onion juice for a long time, often showing mild anemia and jaundice.

Diagnostic methods

(1) Consultation Based on the history of feeding onions or cooked food with onion juice and typical hemoglobinuria, the diagnosis can basically be made.
(2) Laboratory tests: Routine blood tests (Acute poisoning: The plasma is pink, the number of red blood cells, hemoglobin amount and Ht value are moderately reduced, the reticulocytes are increased, and the red blood cells vary in size and are obviously polychromatic) sex, a slight increase in the total number of white blood cells, etc. Chronic poisoning: an increase in polychromatic red blood cells and red blood cells with a large number of Heinz's bodies.), blood biochemistry and urine tests are helpful in the diagnosis of the disease.

Treatment of onion poisoning in dogs

Mildly poisoned dogs can recover naturally after immediately stopping feeding onions; for dogs with severe hemolysis, intravenous injection of glucose solution or Ringer's solution, ATP, and coenzyme A, VC, etc.; oral or intramuscular injection of vitamin B complex and vitamin E. Administer sodium caffeine and furosemide subcutaneously; for severely anemic dogs, blood transfusions or blood replenishing agents can be given. Antibiotics, prednisone, dexamethasone, etc. can be appropriately given according to the condition of the sick dog.

Note

1. The disease usually develops 2 days after eating onions, and many develops after a week;
2. Dog owners do not know that onions can be poisonous and will not tell the doctor about feeding. Fed onions. Doctors often ignore this aspect of consultation. The disease is easily misdiagnosed.
3. History of feeding onions, anemia, and hemoglobinuria are diagnostickey to the disease.
4. Blood transfusion when necessary can greatly improve the cure rate of the disease.

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