Can dogs eat tomatoes?
The full picture
Tomatoes are nightshades and contain solanine — but ripe red tomatoes have very little. The toxin concentrates in unripe green tomatoes, leaves, and stems, which can cause real toxicity if eaten in quantity. A few bites of ripe red tomato are fine for most dogs. Bigger cautions: tomato-based sauces usually contain onion and garlic (both toxic), and tomato plants in gardens are a risk if dogs chew leaves or unripe fruit. Keep dogs out of the veg patch.
If your dog has just eaten tomatoes
Do this now
- Work out roughly how much your dog ate and when
- Watch for vomiting, diarrhea, lethargy, or refusal to eat over the next 12-24 hours
- Call your vet if your dog is small, elderly, has existing health issues, or shows any symptoms
- For guidance, the ASPCA Animal Poison Control Center is available 24/7 on (888) 426-4435
What your vet will want to know
Have this information ready when you call:
- Your dog's weight
- Estimated amount eaten
- How long ago
- Any symptoms you're seeing
- Your dog's general health / any existing conditions
Risks to watch for
- Solanine poisoning from green parts
- Stomach upset
- Hidden onion/garlic in tomato sauces
Potential benefits
- Vitamin C, lycopene — but not worth deliberately feeding
Symptom timeline
Symptoms typically progress in stages. Knowing what to expect helps you act fast:
- 2–6 hours GI upset from solanine if green/unripe parts or vines eaten: vomiting, drooling, diarrhea
- 6–24 hours If significant green tomato or vine material: weakness, tremors, possible heart effects
- 24–72 hours If tomato sauce contained onion or garlic: possible anemia signs (pale gums, lethargy, dark urine)
Safe portion size
A few small pieces of ripe red tomato flesh occasionally.
Safer alternatives
- Cucumber
- Red pepper strips
- Carrot
Common questions
My dog just ate a small amount of tomatoes — what should I do?
A small accidental mouthful of tomatoes is usually not an emergency, but it depends on your dog's size and what else was involved. Watch for vomiting, diarrhea, lethargy, or unusual behavior over the next 12–24 hours. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 if you see any symptoms or if your dog is small or young.
Why is tomatoes risky for dogs?
Tomatoes are nightshades and contain solanine — but ripe red tomatoes have very little. The toxin concentrates in unripe green tomatoes, leaves, and stems, which can cause real toxicity if eaten in quantity. A few bites of ripe red tomato are fine for most dogs.
What's a safer alternative to tomatoes?
See the alternatives section above. In general, plain cooked meat (no seasoning), plain vegetables like carrot or green bean, or dog-specific treats are always a safer choice than human foods with uncertain risk profiles.
Can tomatoes make a dog sick long-term?
Repeated small exposures to tomatoes can be worse than a single large accident, depending on the specific risk. Some foods cause cumulative damage (like onion/garlic affecting red blood cells over days), while others just cause repeat GI upset. If your dog has eaten tomatoes multiple times, mention it to your vet at the next visit.
Unexpected vet bills can run into thousands
One emergency visit for food poisoning can cost $500–$10,000+. Compare US pet insurance in 60 seconds.
Learn about vet costs & insurance →Sources
The information on this page is compiled and cross-checked against these authoritative US veterinary and toxicology sources:
- ASPCA Animal Poison Control Center — 24/7 poison hotline and comprehensive toxic food database
- Pet Poison Helpline — veterinary toxicology service
- Merck Veterinary Manual — peer-reviewed clinical reference
- American Veterinary Medical Association (AVMA)
- American Kennel Club Expert Advice
- Cornell University College of Veterinary Medicine
Specific toxicity thresholds cited on this page come from the above sources; where they disagree, we cite the more conservative figure. Numbers are general guidance — individual dogs vary in sensitivity based on age, breed, medications, and health conditions. When in doubt, always call your vet.
Checked against US veterinary guidance — see our editorial standards and source list. If your dog has eaten something and you need urgent advice, call a vet or the ASPCA Animal Poison Control Center on (888) 426-4435.