Has the diarrhea stopped? And if so, are his stools of a normal consistency? With some dogs, once the cortisol has stabilized their coat may change, they may even lose a bunch of fur, but if those spots look reddened or still bother him a trip to the dermatologist may be a good idea. I see in your 3/24 post that an ACTH stim test is going to be done in 3 weeks which will be this week, is a full ACTH stim test going to be performed?