Will tomatoes hurt dogs?
When Are Tomatoes Bad For Dogs? The green parts of Tomatoes, including the stems and vines, as well as unripened Tomatoes, contain a toxin called solanine.
Generally, tomatoes have small amounts of this toxin that won't harm dogs, but when eaten in large quantities, they can cause problems.
Many believe it's instinctual behavior, harkening back to the days when your dog's wild ancestors would mask their scent to help them sneak up on their prey.
Wolves, for example, have been observed rolling in animal carcasses or the droppings of plant-eating animals, to cover up their own smell during the hunt.
Safe: Some Vegetables.
Your dog can have a healthy snack of carrot sticks, green beans, cucumber slices, or zucchini slices.
Even a plain baked potato is OK.
Don't let your dog eat any raw potatoes or any potato plants from your pantry or garden.