Sophie doesn't shed as much as she molts.
She's got this white undercoat that comes out in clumps when the season warms up. It's amazing how much hair she's got left, even after she's been brushed and combed and (seemingly) filled up a 13 gal plastic garbage bag.
Supposedly she's part Bernese Mountain Dog so that may be the reason. It's not the supposed Great Dane part, that's for sure...
Cheers,
Scott.