Dogs can eat tomatoes (in moderation)
There are some human foods that are harmful to dogs no matter the quantity. There are other human foods that are perfectly fine, barring any food allergies. Tomatoes are one of those foods. They are full of nutrients and are healthy for dogs, as they are for humans.
Like apples, tomatoes are full of vitamin A and vitamin C. They also help protect the body from free radicals. They are also a source of lycopene, which is an antioxidant that helps fight cancer and reduces the risk of degenerative diseases. Remember to always give in moderation, and to avoid tomato sauces, which are full of sugars that can upset your dog’s stomach.
Though tomatoes themselves are healthy for dogs, tomato plants and vines can be deadly. They contain tomatine which can cause weakness, vomiting, and excessive drooling and stomach irritation. Because of this, be sure to keep your dog away from tomato gardens, as well as the plants and vines. Tomatine can also be found in unripe tomatoes and small green tomatoes, so these are to be avoided as well.
Tomatoes are officially fruit, but are considered a vegetable for cooking purposes. They are nutritional for both humans and dogs and are perfectly safe if you just follow a few precautions.