Red, is it coming out in clumps like a dandelion or is it just loose hair? There is always a certain amount of loose hair that just comes out and gets on stuff - that's just a corgi for ya. If it is clumping out then, its the real coat blow and is a mess. I have a rubber rake - looks like a highly modified scotch comb - that I use to get as much out as I can. I go back and forth - really get in there and work the coat out because for everything you see that is loose, there is way more that you don't see that is just waiting to come out. Then I bathe in the warmest water tolerable - make sure to protect your drain from all the hair. Then I blow them dry with a dryer - my dog dryer is a lot like our cattle dryers, maybe not quite as powerful so I'd think you could use the cattle blower.. Blow a dog just like a calf... you want to lift and separate the hair. You might have to repeat that in a day or so but within the week, you should have all the old coat out and he'll be back to his beautiful self.