My Carly is (we think) a shepard mix and she sheds ALL the time. You can brush her coat in the morning and you'll get several loads of fur. Brush her again at night and you'll get several more. I've never seen a dog who sheds this much.

Not that she likes being brushed that much anyway. I do capture her occasionally to get some of the loose hair out. But if she sees you coming with the brush - she hides.