Well, a couple-few years ago I knew NOTHING about taking care of a dog the right way, so here is the list. Ellie survived it and I have since changed my ways.
In an attempt to get weight on her, we would give her fried hamburger...probably a whole burger worth at a time.
One time I remember giving her some old roast beef and I'm sure it had onions in it. It was the left-overs and probably quite fatty.
Once some chocolate fell (I wasn't here or this one wouldn't have happened because I knew better). It was the kind with the creamy stuff inside and the cherry in the middle. She got at least 1 or 2 of those and maybe more. She threw up at least 7 or 8 times and we didn't even take her to the vet because I didn't really understand about dehydration and all of that.
She used to get grapes and raisins.
She loves vanilla ice cream and Cheez-Its. If she didn't have pancreas issues, I would probably still give both on occasion.
That's all I can think of for now.