Do you live near a vet school? For dogs with persistant problems and no diagnosis in sight, a vet school can really be a great resource. We live within driving distance of Univ. of Pennsylvania vet school, and I know many people who have gotten help with problems their local vet wasn't able to solve.
This must be really frustrating- I hope you get an answer soon-
This must be really frustrating- I hope you get an answer soon-