i do know that they wrap around the belly, but you can put like a pad in it.i found this description on the net at snootypets.com.. hope it helps  
 http://www.snootypets.com/SnootyPets...ge/10786-5.jpg
    http://www.snootypets.com/SnootyPets...ge/10786-5.jpg
Belly Bands for male dogs helps control lifting their leg or marking around your home.  Velcro band goes around waist and covers their penis, thus inhibiting the urge to mark.  Some customers use women's pantiliners in conjunction just in case of an accident.  They can also be used as potty training aid or incontinent dogs.  Machine Washable/Line Dry