Spinach is high in oxalates, and cats — like dogs — can be prone to calcium oxalate urinary stones and crystals, one of the more common types of feline bladder stone. There's no strong evidence that occasional spinach causes stones in an otherwise healthy cat, but vets generally advise cats with a history of calcium oxalate urinary stones or crystals avoid oxalate-rich foods like spinach altogether.
If offering spinach at all, keep it to a small, plain, cooked amount and only occasionally — never as a regular addition — and skip it entirely for any cat with a known history of urinary stones.
Not typically in healthy cats fed occasional small amounts. But spinach is high in oxalates, and cats with a history of calcium oxalate bladder stones — a relatively common feline urinary condition — should avoid it, since dietary oxalates can contribute to stone formation in susceptible cats.
A small amount of plain cooked spinach is not toxic, but the oxalates are a concern for cats with bladder stones or kidney disease. It is not a regular food, and those cats should avoid it entirely.
Complete cat foods that contain spinach are formulated to be nutritionally balanced, which is different from adding fresh spinach at home. If your cat has a urinary condition, ask your veterinarian about its diet.
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How we calculate results: This tool uses commonly referenced veterinary toxicity thresholds and food safety guidelines. Actual toxicity can vary based on your pet's size, health status, and exact substance consumed. These results are estimates only and do not replace a veterinary assessment.