The Great Dog Bottom Swap

Sit back and enjoy this rollicking canine caper. It’s barking mad!
 
The dogs are having a ball today.
Roll up for the canine cabaret!
 
The day has arrived for the Dogs' Summer Ball. The event is so high class in fact, that each dog must remove their bottom before they are allowed inside the hall. But in the middle of all the frivolity something unexpected happens and the dogs have to make a hasty exit . . . with or without the correct bottom.