Pet ownership fuels expansion for Pet Supplies PlusAt the year’s midway point, Pet Supplies Plus is touting the growth of its pet supplies chain and its dog-washing concept franchise. Pet Supplies Plus arrives on DoorDashMichigan-based pet retailer Pet Supplies Plus is expanding its delivery reach through a new partnership with DoorDash. Pet Supplies Plus, Wag N' Wash tout 2023 franchise agreements, planned growth Pet Supplies Plus and its Wag N’ Wash grooming chain are celebrating strong franchise agreement growth in 2023 while planning dozens of new openings this year. Pet Supplies Plus charts aggressive expansion The largest independent pet franchise in North America is growing its footprint.