| Verdict for cats | Caution |
| Severity | 2 / 5 — Mild — usually stomach upset; watch them. |
| Safe amount | A taste at most |
| Category | Vegetable |
| Source | VCA Animal Hospitals — pet health library · reviewed 2026-08-07 · confidence: medium |
Same oxalate reasoning for cats, and cats are prone to urinary and kidney disease, so this is one to skip rather than experiment with — especially in a cat with any history of urinary crystals.
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 spinach? — Feed with caution to dogs.
Not toxic, but be careful — spinach isn't poisonous to cats, and it comes with caveats that matter. Same oxalate reasoning for cats, and cats are prone to urinary and kidney disease, so this is one to skip rather than experiment with — especially in a cat with any history of urinary crystals.
Watch for: Vomiting; Diarrhea or loose stools; Loss of appetite; Belly discomfort or unusual tiredness. 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.