Compare

Onion vs. Leek: which is safe for cats and dogs?

Onion and Leek are frequently compared because both belong to the Allium genus, sharing similar chemical properties that pose risks to household pets. It is important to understand that both plants are considered potentially toxic to both cats and dogs. While they are common kitchen staples, every part of these plants contains compounds that can cause significant damage to a pet's red blood cells, potentially leading to hemolytic anemia. Because both Onion and Leek carry these serious health risks, neither should be considered safe for your animal companions. If you suspect your pet has ingested any portion of either plant, please contact your veterinarian immediately for guidance.

Onion

Allium cepa

The onion is a bulbous vegetable widely used in cooking that contains compounds capable of damaging red blood cells in pets. Ingestion of any part of the plant, including the bulb, can lead to serious health complications.

cat

Potentially toxic

Consulted references classify the plant as toxic or irritating for that pet type.

Watch for

Vomiting, diarrhea, lethargy, pale gums, and rapid breathing.

dog

Potentially toxic

Consulted references classify the plant as toxic or irritating for that pet type.

Watch for

Weakness, decreased appetite, abdominal pain, and discolored urine.

Full Onion reference →

Leek

Allium ampeloprasum

Leeks are members of the onion family that contain compounds capable of damaging red blood cells in pets. Ingestion of any part of the plant can lead to gastrointestinal upset and potential anemia.

cat

Potentially toxic

Consulted references classify the plant as toxic or irritating for that pet type.

Watch for

Vomiting, diarrhea, lethargy, pale gums, and elevated heart rate.

dog

Potentially toxic

Consulted references classify the plant as toxic or irritating for that pet type.

Watch for

Drooling, abdominal pain, vomiting, diarrhea, and weakness.

Full Leek reference →