I would some time let Marty some some canned chicken soup with his food and that has onion in it. I was told at a farmer coop it was OK for dogs to have a little onion and garlic. The farmer coop had dogs treats with onion and garlic.
It get so confusing as you hear one thing for years then you are told something difference . I will be making Marty dog food after all! I brought him some Paul Newman canned dog food , it was on sale . Marty DID NOT like it!!
He stuck his nose up at it!! The little brat! I wish I knew what his first owner feed him. So I am trying find veggies that are safe for dog to eat. I know carrots and peas are Ok.