Like Cas and Sam walkies would actually happen! Puppy!Sam would snub Castiel's attempt to scratch his ears and also his homemade puppy kibble. Combined with Dean's fear and avoidance of Sam, this would lead to a D/C season in which Sam is relegated to comic relief, such as when he tries to bite clowns, when he's used as bait for the ghosts of former animal abusers, and when he hilariously eats all of Dean's shoes.