Onions

Onion

Pictured: Onion

Poisonous to: Cats, Dogs

Level of toxicity: Generally mild to moderate

Common signs to watch for:

  • Drooling
  • Nausea
  • Oral irritation
  • Vomiting
  • Diarrhea
  • Lethargy
  • Abdominal pain
  • Elevated heart rate and respiratory rate
  • Weakness
  • Exercise intolerance
  • Collapse
  • Pale gums
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Onions, garlic, chives, and leeks are part of theĀ AlliumĀ family and are poisonous to both dogs and cats. Garlic is considered to be about 5-times as potent as onion. Certain breeds and species are more sensitive, including cats and Japanese breeds of dogs (e.g., Akita, Shiba Inu). Toxic doses of onion and garlic can cause oxidative damage to the red blood cells (making the red blood cells more likely to rupture) and gastroenteritis (e.g., nausea, oral irritation, drooling, abdominal pain, vomiting, diarrhea). Other clinical signs of anemia can also occur and include lethargy, pale gums, increased heart rate, increased respiratory rate, weakness, exercise intolerance, and collapse. Onion and garlic poisoning may have a delayed onset and clinical signs may not be apparent for several days.

Poison type: foods

Scientific name: Allium species

Alternate names: Allium, Alliaceae, chives, leeks, disulfides, thiosulfates, garlic, garlic powder, onion powder, dehydrated onions