✓ Reviewed against PDSA, Blue Cross & Animal PoisonLine guidance · Last reviewed: 2026-07
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 ate more than a safe amount
If your dog has eaten ripe red tomato flesh, this is unlikely to be an emergency. If your dog has eaten green tomatoes, tomato leaves, or stems, call your vet — these parts contain solanine which causes GI and neurological symptoms.
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
Safe portion size
A few small pieces of ripe red tomato flesh occasionally.
Safer alternatives
- Cucumber
- Red pepper strips
- Carrot
And while you're thinking about what's good for your dog, keeping on top of flea and parasite prevention is just as important as diet.