We try to keep the poop shoot area on Gizmo trimmed all year round.
In the hot weather he gets his belly, feet and butt trimmed. I also trim a few of the longer hairs around the ears, but I do love his "Angel Wings".
I really don't like the look of a fluffy that is trimmed too much. Gizmo is a sable, which gives him that beautiful "collie" look. Plus I get lots of compliments on how soft his coat is. Now I do know, not all fuffs have the same coat, so it varies for each dog. I'm part of a fluffy group on yahoo, and some of the fluff owners actually love that long butt skirt.
Gizmo is sporting his at the moment, but I intend to get him to the groomer soon. One of the folks on the list posted instructions on how she groomed her fluff. I'll try to find it and post it.