Ive never heard of them before joining this site - it seems like they are a band of stretchy material that fits round the dogs lower belly covering where they wee from - you can buy pads made for them or some ladies use sanitory towels or panty liners ! I guess the its the same principal and you can get them cheaper.
They are handy if say visiting a friends house and you dont want the chance of any accidents at all or while travelling etc |