Is anyone here familiar with what is torturing my dog? He itches so badly and as the rash gets worse, his abdomen turns from red to black. The skin is now turning hard, I feel so badly for him! I'm giving him a benedryl daily which gives him some relief. I will definitely bring him to the vet again with this, but I was wondering if this 'black skin' thing is common! I've had many dogs, but never any to be plagued by this torture!Can anyone here add to my knowledge about this?