My boyfriend and I have a Pit/Lab mix but I've also lived with:
a bordercollie/flat coated retriever mix,
a german shorthair pointer/viszla mix,
a black lab,
two schnauzers,
a black lab/rottweiler mix,
a german shepherd/chow mix,
and a small-ish red fuzzy thing. I'm convinced she's a Nova Scotia Duck Tolling Retriever but we got her from a shelter at four months old as an australian shepherd mix. So who knows.
And they were all shelter dogs except the schnauzers and the black lab. We do so love our rescues