Why?
Apple flesh isn't toxic, but it's sugary, and as an obligate carnivore your cat has no need for it. The seeds, stem and leaves contain cyanogenic compounds that can release cyanide when chewed. The tough core is also a choking hazard and hard to digest.
How much?
Two or three pea-sized pieces once in a while is plenty. Wash and peel the apple, remove the core and every seed, and serve it raw or cooked, with no added sugar.
The risks
- Seeds, stem and leaves contain cyanogenic compounds
- Choking on the core or a large chunk
- Diarrhea or bloating from too much fruit
- Extra sugar, a concern for diabetic or overweight cats
Your cat ate some: what now?
A piece of apple, even with a seed or two, is usually nothing to worry about. Watch your cat for 24 to 48 hours for vomiting, diarrhea or unusual tiredness. Call your vet if those signs appear, or if your cat chewed a lot of seeds or swallowed a whole core.
Better options
For a treat your cat will actually appreciate, try a small piece of plain cooked chicken or a cat treat. If they like to nibble greens, offer some cat grass.
Common questions
Can cats eat apple skin?
It isn't toxic, but it's tougher to digest and may carry pesticide residue. Peeling the apple is the safer choice, especially for kittens.
Can cats have applesauce?
Plain, unsweetened applesauce is fine as a lick now and then. Skip versions with added sugar, spices or sweeteners.
This information is general and does not replace advice from a veterinarian. If your cat has swallowed something toxic, call your vet or an animal poison control center right away, without waiting for symptoms.