My dog Zippy had surgery 8 weeks ago on his belly and pelvic area. They had to surgically shave the whole back half of him bald---he also has a shaved bald patch where his IV was hooked up. He is a Manchester terrier who has a thin short black shiny coat like a Doberman. Zippy has healed up wonderfully well and is back to running around----But it has now been 8 weeks and hardly any of his coat has grown back where it was shaved----Does anyone have any experience with this or how long it usually takes to grow a normal short coat back? Thanks