I have a 13 year old quarter horse mare. This last spring she started to loose all of her hair. I had a vet out and he said that the screwy weather (cold-warm-cold-warm) put her into shed mode a second time and that she would loose all of her hair but the mane and tail and it would grow back in a couple of weeks. It grew back like he said but the vet charged me $240 just to look at her and say that. Vets don't come cheep,but thats the price we have to pay to have pets. Glad your dog got better.