Onions vs Garlic for pets
Which is safer for your dog or cat — and why.
The verdict for dogs
Both onions and garlic are toxic for dogs. Onions (and all alliums — garlic, leeks, chives, shallots) contain N-propyl disulfide, which damages dogs' red blood cells leading to hemolytic anemia. ALL forms are toxic: raw, cooked, dehydrated, powdered. On garlic: Same allium toxicity but more concentrated. Some 'natural pet supplements' use garlic — these are controversial and most vets recommend avoiding.
The verdict for cats
Both are toxic for cats. Remember cats are obligate carnivores — even safe plant foods are treats, not staples.
Detailed comparison
| Onions | Garlic | |
|---|---|---|
| Dogs | NO — destroys red blood cells | NO — 5× more toxic than onion |
| Cats | NO — even more toxic than to dogs | NO — extremely toxic |
| Category | vegetables | vegetables |
Why this matters
Owners often look for safe alternatives when one food turns out to be risky. Comparing onions to garlic side-by-side helps you make the right swap without trial and error. When in doubt, stick to the food rated safe and skip the rest entirely — pets thrive on consistency, not variety.