Roughly 5× more potent than onion. Same red-blood-cell destruction — and garlic powder is concentrated.
Extremely dangerous for cats. Even small regular amounts (scraps, sauces) accumulate.
Same thiosulfate mechanism as onion, at much lower doses.
Lethargy, pale gums, elevated heart rate, collapse in severe cases.
Vet immediately for anything beyond a trace amount.
ASPCA Animal Poison Control: (888) 426-4435 · Pet Poison Helpline: (855) 764-7661 — 24/7, a fee may apply. Your own vet first when reachable.