Can dogs eat watermelon, isn't it dangerous or poisoneus for them?

I have a really sweet 4 months old puppy and she loves all the fruits and vegetables so far. I give her a bite of everything I eat cause I'm curious wether she likes that type of food or not. I've read a lot of articles about giving raw food is genuinely healthy for them but I still can't believe that they may eat each and every type of fruits, vegetables. Of course I know that they shouldn't eat chocolate and sugary stuff, as well as too spicy ones. Please give me some clue wich vegetables and fruits are poisoneus for the dogs.