Ripe tomato flesh is safe in small amounts, but tomatoes are acidic — and the plant's leaves, stems, and unripe fruit contain toxic solanine.
Keeper's noteAn occasional slice of ripe tomato is fine. Never offer the vine as a perch or toy, and skip ketchup and pasta sauce — that's salt, sugar, and onion territory.
What to watch out for with tomatoes
Tomatoes are nightshades. The green parts — vines, leaves, stems, and green unripe fruit — contain solanine, which is toxic to birds. Ripe red flesh contains negligible solanine but is acidic enough to cause digestive upset if fed often.
How to serve it
Ripe, red flesh only — a slice or a cherry tomato half, occasionally.