Yes I do know this too, but throughout all the years we had dogs (not had one for many years now), I had no idea that so many things, including grapes - fresh or dried - and chocolate are deadly to dogs. We used to give our dogs chocolate. Fortunately they were all big dogs, and we would only ever give them a small piece 'as a treat', and there were never any ill effects.
Another everyday item that is potentially harmful to dogs is onion, either cooked or raw. It can kill their red blood cells, causing anaemia. Eating a lot can poison them. So think about this when you scrape the leftovers from your dinner into their bowls!
One of the many things I thank the internet for - and particularly social media - is this knowledge that is these days spread far and wide.