I have a 2 year old shih Tzu named Barry, and since he was 1 (or maybe under that?) I've always shared my fruit with him, I figured that because it was good for me it was also good for him, as he grew older, (as in, 7 months old) me and my mam started to Google what food he can and can not eat, he's a family dog so I guess we just wanted to make sure everyone knew about his health. It was only when he was about 1 when I read that grapes were toxic for dogs, I freaked out because by then, I'd already given him lots of grapes. (I've stopped giving them to him after that just in case) But the thing is, nothing has ever happened to him, I've read online that if a dog ingests grapes you have to call the vet for emergency immediately, but my dog is 2 now and everytime we go to the vet they say he's fine, is it a breed thing? Or can some dogs avoid being poisoned? I'm very curious because shih Tzu's are small dogs, so wouldn't that make them more vulnerable? I'd just like to know.