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Only part of it, in small amounts. Ripe red tomato flesh is fine in small amounts. The green parts are not: unripe fruit, leaves and stems carry solanine and tomatine, and garden plants should stay fenced off.
Standards checked
The American Kennel Club's tomato guide gives the answer as yes and no. Red, ripe tomato flesh is considered non toxic and can be shared in small amounts as an occasional snack. The plant is a nightshade, though, and its green parts, the leaves, stems and unripe green fruit, carry solanine and a related compound, tomatine. Those chemicals are the plant's defence against being eaten, and they work on dogs. The rule that follows is simple: ripe and red is a treat question, anything green is a poison question.
Offer a small amount of washed, ripe flesh with every trace of green removed, diced so it goes down easily, and watch how your dog responds before offering more. The AKC notes that too much tomato can upset the stomach through acidity alone, so moderation applies even to the ripe fruit. Cherry tomatoes follow the same rule, cut into pieces for small dogs. What does not follow the fruit onto the plate is tomato sauce: sauces typically add garlic and onion, both toxic, plus salt and sugar a dog does not need.
Most tomato trouble starts outdoors, where a dog can graze the plant itself. The AKC advises fencing vegetable gardens so dogs cannot sample produce unsupervised, and small breeds and puppies need the least plant material to be affected. Tomatine poisoning is rare and usually not fatal, but its signs are worth knowing: loss of coordination, appetite loss, muscle weakness, drooling, dilated pupils, tremors, lethargy, abdominal pain and gut upset. A dog found with a stripped tomato vine and any of those signs needs a vet, not a search engine.
Estimate how much plant material is gone, keep the dog away from the garden, and call your veterinarian for guidance, especially for puppies and small dogs. A single green cherry tomato may pass without drama, but quantity is everything with this plant and you cannot weigh what you did not see eaten. Our emergency guide covers the general response to anything green and growing.
This page is general information drawn from the published guidance of the organisations listed under Sources below. It is not veterinary advice, and it does not replace your own veterinarian, who knows your dog. If your dog has eaten something toxic, contact your veterinarian, the ASPCA Animal Poison Control Center on (888) 426-4435, or the Pet Poison Helpline on (855) 764-7661 straight away. A consultation fee may apply on the helplines.
Last updated: November 2026. Every verdict on this page was checked against at least two of the sources listed below. How we work: our methodology.
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