Can Dogs Eat Tomatoes? Everything You Need To Know.
Can dogs eat tomatoes? Yes, ripe red tomatoes are safe in small amounts, but green tomatoes, stems, leaves, and most sauces are not. Learn how much is safe by weight, the tomatine and solanine risks, allergy signs, and what to do if your dog ate a tomato.
Veterinarian · BVMS, MRCVS
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Can dogs eat tomatoes? Yes, dogs can eat ripe red tomatoes in small amounts, and the American Kennel Club lists ripe tomatoes among the human foods that are safe for dogs. The catch is that tomatoes belong to the nightshade family, and the green parts (unripe fruit, stems, leaves, and vines) contain a substance called tomatine that can be toxic in larger amounts. A few bites of plain, ripe, red tomato flesh will not harm most healthy dogs. Keep all treats, tomatoes included, to no more than 10% of your dog's daily calories, and always remove the stem, leaves, and any green portions first. Serve it plain, with no salt, sauce, onion, or garlic. If your dog eats green tomatoes or chews on a tomato plant and then drools heavily, vomits, or seems weak or wobbly, call your veterinarian or the ASPCA Animal Poison Control Center right away.
- 1Yes, dogs can eat ripe red tomatoes in moderation; the soft red flesh is non-toxic and low in calories.
- 2Green or unripe tomatoes, plus the stems, leaves, and vines, contain tomatine and should be kept away from dogs.
- 3Keep tomatoes to about 10% of daily calories: a slice or two for small dogs, a few small pieces for large dogs.
- 4Skip tomato sauce, paste, ketchup, and soup; these often hide onion, garlic, salt, sugar, or xylitol.
- 5Use extra caution with diabetic dogs or dogs prone to stomach upset, and call your vet if your dog eats a tomato plant.
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Are tomatoes good for dogs?
In small amounts, ripe tomatoes are a low-calorie, hydrating snack rather than a true health food for dogs. A medium tomato is roughly 95% water and only about 22 calories, so a bite or two will not derail a weight-management plan. Dogs make their own vitamin C and get complete nutrition from a balanced dog food, so think of tomato as an occasional flavor treat, not a supplement.
That said, ripe tomato flesh does carry a few useful nutrients. Here is what it offers a dog in the small portions that are safe:
- Lycopene: the antioxidant pigment that makes tomatoes red, studied for its role in cell and heart health.
- Vitamins A and C: support vision, immune health, and skin, and act as antioxidants.
- Potassium: supports healthy nerve and muscle function.
- Fiber: the small amount in a tomato supports normal digestion, though the quantities a dog eats are modest.
Tomato is technically a fruit, and there are sweeter, lower-risk fruits that most dogs enjoy more. If you are building a rotation of healthy treats, strawberries and blueberries deliver antioxidants without the nightshade question that comes with tomatoes.
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How many tomatoes can a dog eat? Serving size by weight
Tomato is a treat, not a meal, so it falls under the 10% rule that most veterinarians and the American Kennel Club recommend: treats of all kinds should make up no more than 10% of your dog's daily calories, with the other 90% coming from a complete, balanced dog food. Because tomatoes are mostly water and acidic, the bigger risk from overdoing it is an upset stomach or loose stool rather than weight gain, but portion control still matters, especially the first few times.
Use this chart as a starting point for plain, ripe, de-stemmed tomato flesh, and scale down for a dog's first taste:
| Dog weight | Ripe tomato (plain, de-stemmed) as an occasional treat |
|---|---|
| Under 10 lbs (toy breeds) | 1 small cherry tomato or a thin slice, quartered |
| 10 to 25 lbs (small) | 1 to 2 cherry tomatoes or 1 thin slice |
| 26 to 50 lbs (medium) | 2 to 3 cherry tomatoes or a couple of slices |
| 51 to 90 lbs (large) | A few small pieces, about a quarter of a medium tomato |
| Over 90 lbs (giant breeds) | Up to half a medium ripe tomato, diced |
These are occasional amounts, not daily targets. Tomato is acidic, so even a dog that tolerates it well does better with a small portion now and then rather than a handful every day. If your dog already gets biscuits, chews, or table scraps, count the tomato as part of that same 10% treat budget instead of an extra.
- Offer one small piece of ripe tomato and wait 24 hours. If there is no vomiting, loose stool, or itching, it is fine to offer the amounts in the chart as an occasional treat. Introduce tomato on its own, not alongside other new foods, so you know what caused any reaction.
Can dogs eat cherry tomatoes?
Yes, dogs can eat ripe cherry tomatoes in small amounts, and the same rules apply as for any tomato: they must be fully red and ripe, with the green stem removed. Cherry and grape tomatoes are simply small tomatoes, so a ripe one is no more or less toxic than a slice of a larger ripe tomato.
The one extra consideration is size and shape. A whole cherry tomato is a round, slippery, bite-size object, which makes it a choking and gulping hazard for small dogs and fast eaters. Cut cherry tomatoes in half or into quarters before offering them, just as you would a grape-shaped food, so your dog cannot inhale one whole.
Can dogs eat green or unripe tomatoes? The tomatine and solanine risk
No. Green, unripe tomatoes and the green parts of the plant are where the real danger lives. Tomatoes are members of the nightshade family, and the green portions contain a natural compound called tomatine (along with a smaller amount of solanine). These substances protect the plant from pests, and in large enough amounts they are toxic to dogs.
The good news is that tomatine levels drop sharply as a tomato ripens. A fully red, ripe tomato contains only a trace, which is why the ripe flesh is considered safe in moderation. Unripe green tomatoes, the stems, the leaves, and the vines hold far more, so they should be kept out of reach entirely. The highest-risk scenario is a dog with access to a backyard tomato garden, where it can chew on plants and unripe fruit unsupervised.
Signs of tomatine poisoning usually appear within a few hours and can include drooling, vomiting, diarrhea, loss of appetite, lethargy, muscle weakness or tremors, an unsteady or wobbly walk, and a slowed heart rate. A dog would generally need to eat a significant quantity of green material to reach this point, but because the symptoms can affect the heart and nervous system, any suspected ingestion is worth a call to your vet.
- Fence off garden tomato plants or grow them where your dog cannot reach. The leaves, stems, vines, and unripe green fruit carry the most tomatine. If your dog chews on a plant and then drools, vomits, trembles, or seems weak or uncoordinated, treat it as urgent and call your veterinarian or an emergency clinic.
Can dogs eat tomato sauce, paste, ketchup, or soup?
It is best to skip them all. The problem with tomato sauce, paste, ketchup, marinara, pizza sauce, and canned tomato soup is rarely the tomato itself. It is everything mixed in. These products are usually loaded with salt and sugar, and most contain onion and garlic, both of which are toxic to dogs and can damage red blood cells. Some sugar-free or low-calorie sauces and ketchups may even contain xylitol, a sweetener that is highly toxic to dogs.
A small lick of plain tomato sauce off a plate is unlikely to cause an emergency, but it offers your dog nothing good and adds salt, onion, and garlic you do not want in the bowl. If you want your dog to enjoy tomato, give a few pieces of the plain, ripe, fresh fruit instead. Sun-dried tomatoes are also best avoided, since they are often packed in oil and salt and sometimes seasoned with garlic.
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Are dogs allergic to tomatoes? Signs to watch for
A true tomato allergy is uncommon, but like people, dogs can develop a sensitivity to almost any food, and some dogs are also sensitive to plants in the nightshade family. Most reactions show up the first few times a dog eats a new food, so watch closely the first time you offer tomato. Signs of a food allergy or intolerance in dogs include:
- Skin issues: redness, itchiness, hives, or noticeably more scratching, biting, or paw-licking than usual.
- Digestive upset: vomiting, diarrhea, or excessive gas.
- Chronic ear infections, which are commonly linked to food allergies in dogs.
- Swelling of the face, lips, or ears, which in rare severe cases needs urgent veterinary care.
If your dog shows any of these signs after eating tomato, stop offering it and call your veterinarian. Most reactions are mild and resolve once the food is removed, but your vet can help you confirm whether tomato is the culprit and rule it in or out for the future.
Which dogs should avoid tomatoes?
Ripe tomato in small amounts is safe for most healthy dogs, but a few groups should skip it or get a vet's sign-off first. Because tomato is acidic and contains some natural sugar, it changes the calculation for certain dogs.
Dogs with a sensitive stomach, acid reflux, or a history of pancreatitis: the acidity can trigger gas, loose stools, or reflux, and any sudden dietary change can upset a sensitive system. Introduce it slowly, if at all, and check with your vet first. Our guide to pancreatitis in dogs explains the warning signs to watch for.
Diabetic dogs: tomatoes are low in sugar compared with many fruits, but the sugar and carbohydrates still count toward the day's total, so clear any new treat with your veterinarian first.
Small breeds and fast eaters: whole cherry tomatoes are a choking risk, so always cut them down. Dogs with a known nightshade sensitivity should avoid tomatoes altogether. When in doubt, a quick call to your vet is the safest path for any dog with a chronic condition.
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My dog ate a tomato or tomato plant: when to call the vet
What to do depends entirely on what your dog ate. A ripe red tomato is very different from a green one or a mouthful of leaves and stems. Here is the playbook if your dog gets into tomatoes or the garden:
- Identify what was eaten. A bite or two of ripe red flesh is rarely a problem. Green tomatoes, leaves, stems, or vines are the higher-risk parts and need closer attention.
- Remove the rest and offer water. Take away any remaining tomato or plant material so your dog cannot keep eating, and make sure fresh water is available.
- Watch for symptoms. After ripe flesh, the worst you usually see is mild gas or a loose stool. After green parts, watch closely for drooling, vomiting, diarrhea, weakness, tremors, or a wobbly walk over the next several hours.
- Call your vet if anything seems off. If your dog ate green tomatoes or plant material, or shows any of the symptoms above, contact your veterinarian promptly. Some garden foods are far more dangerous than tomatoes, so it always helps to know what to do if your dog ate something potentially toxic.
- Keep a poison hotline handy. If your dog ate a large amount of green tomato or plant, or you are worried about onion or garlic in a sauce, the ASPCA Animal Poison Control Center is available 24/7 at (888) 426-4435.
How to safely serve tomatoes to your dog
Prep is simple, and a few rules keep tomato in the safe zone:
- Choose fully ripe, red tomatoes only. Skip anything still green, hard, or unripe.
- Remove the stem, leaves, and any green spots. Wash the tomato to rinse off any pesticide residue.
- Cut it into small, bite-size pieces, and halve or quarter cherry tomatoes to prevent choking.
- Serve it plain. No salt, oil, butter, onion, garlic, or seasoning, and never a sauce or ketchup.
- Keep portions small and occasional, and count them inside the 10% treat budget.
- The only tomato your dog needs is plain, ripe, red flesh with the stem and green parts removed. Never add salt, sauce, onion, or garlic, and never offer green tomatoes or plant trimmings. The fresh fruit on its own is exactly what your dog wants.
If your dog likes crunchy, fresh snacks, there are plenty of dog-safe options to rotate in alongside the occasional tomato, such as apples, edamame, and hydrating watermelon.
And whatever treat you reach for, always read the label on any sauce, sugar-free, or 'lite' product first. The U.S. Food and Drug Administration warns that even small amounts of xylitol can cause a dangerous drop in blood sugar and liver failure in dogs.
Yes, in small amounts, as long as they are fully ripe and red with the green stem removed. Because a whole cherry tomato is round and slippery, cut it in half or quarters first to prevent choking, especially for small dogs and fast eaters.
Yes. Green, unripe tomatoes and the stems, leaves, and vines contain higher levels of tomatine, a substance that can be toxic to dogs in larger amounts. Keep green tomatoes and tomato plants out of reach, and only offer the ripe red flesh.
Keep tomatoes to about 10% of your dog's daily calories as an occasional treat: a quartered cherry tomato or thin slice for a small dog, up to about half a medium ripe tomato, diced, for a large dog. Start with one small piece the first time.
It is best to avoid them. Tomato sauce, ketchup, marinara, and canned soup usually contain salt, sugar, onion, and garlic, and some sugar-free versions contain xylitol. Onion, garlic, and xylitol are all toxic to dogs. Offer plain, fresh, ripe tomato instead.
A true tomato allergy is uncommon, but some dogs are sensitive to tomatoes or other nightshade plants. Watch the first time you offer it for itching, hives, vomiting, diarrhea, or facial swelling, and stop feeding it and call your vet if any appear.
Remove any remaining tomato or plant, and watch for drooling, vomiting, diarrhea, weakness, tremors, or an unsteady walk over the next few hours. A single small bite is usually low risk, but call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 if your dog ate a lot or shows symptoms.
A tiny piece of ripe red tomato is unlikely to harm a puppy, but a puppy's stomach is sensitive and tomato is acidic, so it is safer to wait and offer gentler treats. If you do try it, give a single small piece, cut up, and check with your vet first.
In small amounts, ripe tomato is a low-calorie, hydrating snack with some lycopene, vitamins A and C, potassium, and fiber. It is not a necessary part of a dog's diet, though, so think of it as an occasional treat rather than a health supplement.
Carol Bryant is the founder FidoseofReality.com and SmartDogCopy.com. A pet product expert, Carol is the Past President of the Dog Writers Association of America (DWAA) and winner of Best Dog Blog. A dog lover of the highest order is how Gayle King introduced Carol when she appeared with her Cocker Spaniel on Oprah Radio’s Gayle King Show to dish dogs. She helps pet, animal, and lifestyle brands achieve copywriting and content marketing success using well-trained words that work and is well-known in the pet industry.
Veterinarian · BVMS, MRCVS
Dr. Pippa Elliott, BVMS, MRCVS, is a veterinarian with nearly 30 years of experience in companion animal practice. Dr. Elliott earned her Bachelor of Veterinary Medicine and Surgery from the University of Glasgow. She was also designated a Member of the Royal College of Veterinary Surgeons. Married with 2 grown-up kids, Dr. Elliott has a naughty Puggle named Poggle, 3 cats and a bearded dragon.
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