My 10 y/o GS Ellie has always been a shedder (aren't they all?) but this summer she has been shedding chunks of fur. They're like big tufts of it. You can actually pull chunks of hair out of her. You can't see any skin or anything, but there is TONS of fur everywhere. I could brush her for hours and hair will still come off. Does this sound normal? She's acting fine otherwise. Thanks for your help - again!