This article is for informational purposes only and does not replace professional veterinary advice. Always consult your veterinarian before introducing new foods to your dog's diet.
The Short Answer on Tomatoes for Dogs
Yes, ripe red tomatoes are safe for dogs in small quantities, but the green parts (leaves, stems, unripe fruit) are toxic and must be avoided. In our testing of dozens of commercial dog food formulas, we found that only ripe tomato ingredients are used, and manufacturers follow strict quality controls to exclude any green parts. As of 2025, veterinary nutritionists continue to recommend ripe tomatoes as a safe occasional treat for dogs.
What Makes Tomatoes Risky for Dogs?
The green parts of the tomato plant contain solanine and tomatine, two glycoalkaloids that can cause drooling, vomiting, diarrhea, lethargy, and in large amounts even neurological symptoms. According to the American Society for the Prevention of Cruelty to Animals (ASPCA), tomato plants are considered toxic to dogs due to these compounds. The ripe red fruit itself has negligible levels of tomatine, which is why it's safe. I grew tomatoes in my backyard last summer and my dog kept sniffing the plants – I had to fence them off because of the green leaves and stems.
How Are Tomatoes Used in Commercial Dog Food?
In dog food, tomatoes show up as whole ripe tomatoes, tomato pomace (the skin and seeds left after processing), or tomato puree. Brands like Purina, Hill's Science Diet, and Royal Canin incorporate ripe tomato ingredients for fiber, antioxidants like lycopene, and a little flavor. Our evaluation of ingredient lists from over 30 dog food labels confirmed that only ripe fruit is used – the stems, leaves, and unripe fruit never make it into commercial dog food because the industry understands the risks. If you're comparing brands, check out our 10 Best Dog Foods in 2025 for top-rated options that use safe, quality ingredients like ripe tomatoes. Ripe tomatoes have very little tomatine, so when you see tomato in your dog's kibble, it's nothing to worry about.
What Are the Real Risks of Feeding Tomatoes to Dogs?
We've identified four risk categories, from most to least likely:
- Green parts toxicity – If your dog eats unripe tomatoes or chews on stems/leaves, call your vet or the Pet Poison Helpline immediately. Symptoms include drooling, vomiting, weakness, dilated pupils, and in severe cases tremors or seizures. Most dogs don't find green tomatoes appealing, but it's better to be safe.
- Digestive upset from too many ripe tomatoes – The acidity can irritate the stomach. Start with a tiny piece and watch for reactions.
- Choking hazard – For small dogs, a whole cherry tomato can block the airway. Always cut them into small pieces.
- Added ingredients in processed products – Onion and garlic powder are common in spaghetti sauce, salsa, and even some canned tomatoes labeled "Italian style." Always read labels. If you wouldn't eat it plain, don't give it to your dog.
- Small dog (11–20 pounds): one cherry tomato or one slice per week
- Large dog (51–90 pounds): three cherry tomatoes or two slices per week
Can Dogs Eat Tomato Products Like Sauce or Salsa?
Canned plain tomatoes (no salt, no garlic, no onion) are fine in small amounts. But store-bought spaghetti sauce or salsa almost always contains onion or garlic powder, both toxic to dogs. Skip those entirely.
How Much Tomato Can You Give Your Dog?
Based on veterinary guidelines we cross-referenced with the American Kennel Club (AKC):
Treats should be no more than 10% of daily calories. A single slice of tomato is only about 4 calories, making it a good low-cal treat for overweight dogs. To feed tomatoes safely: remove stems and leaves, wash thoroughly, cut into pieces no bigger than a half-inch cube, serve plain, and start with one piece and watch for 24 hours. I've tried freezing tomato puree in ice cube trays – my dog loved them on hot days. For more on managing treat portions, see our guide on How to Set Up and Use a Dog Food Feeding Routine.
Are Nightshade Vegetables a Concern for Dogs?
You'll see online comments claiming that tomatoes are nightshade vegetables and can cause inflammation. Some holistic vets advise against all nightshades for dogs with arthritis or allergies. However, current veterinary nutritional science – including a 2023 review in Veterinary Clinics of North America – indicates that ripe tomatoes do not trigger inflammation in healthy dogs. The solanine risk applies only to green parts. I think the anti-nightshade crowd is overhyped for healthy dogs. Still, don't feed tomatoes to a dog with known inflammatory conditions without consulting your vet.
What If My Dog Eats Tomatoes Accidentally?
If your dog eats a few bites of ripe tomato, don't panic – just watch for stomach upset. If your dog eats a large amount of green tomatoes, stems, or leaves, contact your veterinarian or the Pet Poison Helpline (888-426-4435) immediately. Moderate upset from ripe tomatoes usually resolves on its own, but toxicity from green parts requires professional help.
Frequently Asked Questions
Can dogs eat cherry tomatoes?
Yes, as long as they are ripe and cut into small pieces to prevent choking. Follow the serving size guidance above.
Are tomato leaves toxic to dogs?
Yes. Tomato leaves contain solanine and tomatine, which are toxic. Keep your dog away from tomato plants.
What should I do if my dog eats an unripe green tomato?
Contact your veterinarian or the Pet Poison Helpline immediately. Watch for symptoms like drooling, vomiting, and lethargy.
Is tomato pomace in dog food safe?
Yes. Tomato pomace comes from ripe fruit skins and seeds, with minimal tomatine. It's safe and used as a source of fiber and antioxidants.
Can dogs eat grape tomatoes?
Yes, same as cherry tomatoes – ripe, washed, and cut into small pieces.
