Last reviewed: 2026-09-05 · Reference ranges: ASPCA, Pet Poison Helpline & Merck Veterinary Manual
Symptoms usually appear 1 to 4 days after ingestion. Early signs include vomiting, diarrhea, and loss of appetite. More serious effects like weakness, pale gums, and rapid breathing develop as the toxin damages red blood cells. This is an emergency; contact your vet or the ASPCA Animal Poison Control Center at (888) 426-4435 immediately.
Do not feed · Dogs · full breakdown on the linked food page
Concentrated onion, and it hides in stock cubes, gravy and baby food.
The full verdict, portion guidance and serving notes are collected on the Onion powder food facts page.