We grew up rural. When we got a dog after puppyhood, my father would give the dog food and let it munch a while and then slowly take the food from the dog, if it growled snapped or whatever it was history.
We had 14 dogs growing up, never had a biter or snapper
I grew up with small dogs. We had a rather expensive Cocker Spaniel. The dog had mental issues. We couldn’t keep it as it would bite for any reason. Parents gave it to a biker. Dog led a great little life riding bitch on a motorcycle.