It depends on the kind of slobs they are. Do they:

A) Fling blobs of strawberry jam and spill crumbs?

B) Get sharp stones stuck in their athletic shoe treads and then shuffle inside without removing their shoes and pirouette on any smooth surfaces they can find?

Type A, I would risk it. Type B, definitely not. :-(

Three sloppy teenagers: not a problem. Three dogs the size of sloppy teenagers: more of a problem (but not unsurmountable).