| Verdict for cats | Caution |
| Severity | 2 / 5 — Mild — usually stomach upset; watch them. |
| Safe amount | A taste at most |
| Category | Human snacks |
| Source | ASPCA Animal Poison Control — People Foods to Avoid Feeding Your Pets · reviewed 2026-08-07 · confidence: medium |
Pure fat with no benefit, and garlic versions are toxic. Not for cats.
Don't make it a habit. Watch for vomiting, diarrhea or a lost appetite over the next day and call your vet if it doesn't settle or your cat seems unwell.
Never induce vomiting and never give any medicine unless a vet tells you to — it can do more damage than the poison. What we will and won't tell you.
If you're sharing food because you want to treat them, a treat formulated for cats does the job without the guesswork.
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Can dogs eat mayonnaise? — Feed with caution to dogs.
Not toxic, but be careful — mayonnaise isn't poisonous to cats, and it comes with caveats that matter. Pure fat with no benefit, and garlic versions are toxic. Not for cats.
Watch for: Repeated vomiting; A painful, tense belly — some dogs stretch into a 'praying' position; Loss of appetite and lethargy; Diarrhea. Some signs lag by a day — call, don't wait.
The safe amount is a taste at most, as an occasional treat rather than a daily habit. Large amounts mainly cause stomach upset; if that doesn't settle within a day, call your vet.