My dog has a rash which is spreading throughout his body. I'm not happy with the diagnosis our vet has given him and it only seems to be getting worse. He is a 7year old German Shepard and around his private areas he's getting pink/black skin.. This is now spreading to other places and I am finding fur with bits of skin over the house. I have taken photos but it's not allowing me to attach pictures. He has been diagnosed with an irregular heartbeat so I'm worried this could be something more serious or trigger something more serious. He doesn't seem his normal happy self since he's had this rash and it's been 6months with two antibiotic shots, nothing has improved.