pee pads, you name it!) and it's a known fact that dogs don't thrive on inconsistencies. So if Rover uses grass as his favorite potty spot at home, a pet sitter might not have much luck taking him on ...
A good choice is investing in a grass box or grass potty patch, basically a grass litter box or grass pad just made for dogs. This should help your puppy when it's time to transition to real outdoor ...