My dog eats vegetables all the time, he really prefers it to meat. He will eat lettuce, carrots which are great for dogs,raw or cooked, he likes raw potatoes, both   baking  and sweet,onions but they are a no no the vet said.He likes everything I eat except popcorn and I don't know why he want eat it. I buy right off the grocery shelf and the vet said he is healthy, has muscles instead of fat and his teeth are good. Has your dog been around where he could have got the mange? The raw spots are one of the signs of mange that dogs do pick up from other dogs.Put some vaseline on the spots to soothe it.He may lick some of it off, put it want hurt him.I feel for you and the dog. Hope he gets better soon.