My dogs get a fair amount of onions with their food and it doesn’t bother them.
I have an ongoing discussion w/my vet over this. 4 dogs survived spaghetti sauce, chili and various other meals just fine with no anemia.
The *puppy* is now nearly 80 pounds at 6 1/2 months and I do make sure he gets a limited exposure to onion, but all my recipes begin with *saute one onion....*. My last dog, who lived to be over 12 loved green grapes IF we peeled them for him. He never got too many and was put down when his rear end gave out, but was otherwise healthy.
I dehydrate liver for the pup’s training treats and sprinkle w/about 1/8 tsp of garlic powder. Vet agrees this is too little to hurt and the pup loves it.
Vet says he has never seen a dog ill from chocolate, except for some diarrhea. It depends on how much chocolate and what degree of cocoa it contains. Dark bittersweet is more dangerous than milk chocolate. He tells the story of little peke who ate an entire box of Godiva chocolates and was just fine, if a bit messy on his walks for a few days.
I once knew someone who had an ongoing feud w/the neighborhood dog pack. She ruined a batch of brownies and purposely put it out for the dogs, hoping to kill them. They ate it all and survived. Nasty lady who died shortly thereafter. ‘Nuf said.