Originally Posted by JMAN2013
it is a vitamin deficiency. inbred dogs show this gastrointestinal disorder frequently.not saying yours is i know nothing of it ped.a vitamin for kids will work wonders but if not its digestive system has a disorder. see a diff vet..
I would not offer a diagnosis over a single post without any pictures. Everyone above posted possible causes cause seriously it could be many things. To the OP I would not just start the dog on something without knowing for sure what it is.
I would GUESS it is an allergy or what PK suggested. when they vet said was flea bites did you check to see if any fleas are present? and if so did you treat to kill fleas? My girl gets HUGE welts and bumps from fleas , she has an allergy to them.
I would either go back to the vet so they can see the change and go from there or try a new vet. If it is mange a simple skin scrape will tell you and you can treat from there.