Owners of small dogs have an advantage: they can just plop the dog in a sink or laundry tub. But if you can’t fit your dog in a sink, use the bathtub, or get in the shower with her and use a detachable nozzle. A portable doggie tub is also an option. While some tubs are made of heavy plastic, others are collapsible and can easily be used outside or in the laundry room or mudroom. Some grooming or pet supply stores rent out dog tubs and towels.