Yesterday my dog Suzi-Q gave me such a scare! I came home to find her eager to see me, but she had vomited greenish puke all over the floor - and a single green grape lay underneath the coffee table. Yikes! Grapes are toxic, lethal, to dogs. On my way out the door previously, I had been carrying a bunch of grapes in my hand, and one (or more?) must have fallen to the floor where she found it and ate it in my absence.
She is fine today, but I think I may give up grapes (and chocolate) so I won't have any more accidents like this!