Not sure why you’re being downvoted - this is a great summary of the issue

Saying “food that is healthy for you is healthy for your dog” is absolutely not true, there are plenty of fruits & vegetables that are great for people, but terrible for dogs. For example, this article lists 19 fruits & veggies that are harmful for dogs - https://iheartdogs.com/10-veggies-fruits-that-are-harmful-to-dogs/