Very sad, I know what it’s like to lose part of the family, chocolate is a real hazard with dogs.
I’ve read where sugarless gum is real bad too. A friend had a small dog that ate just a few of them and died.
With our first mutt I recall when he got into the kid’s Halloween candy and my wife understood how bad it could be and freaked out. The vet said to try to give him some Ipekac to get him to throw up - but he probably won’t like the taste and we might have to bring him in.
He gobbled down one bottle like it was candy - and nothing. So my wife called the vet again. “Well - give him some more until he does!”
We had three kids, and three bottles. After him gulping down the third bottle and still nothing, the vet was amazed. I can’t recall now if the vet said to not worry about the dog - he’s made of steel, or if my wife brought him in to get his stomach pumped or whatever.
I do recall cleaning up the backyard with lots of candy wrappers in his poop for awhile!