Not to deliver it, but to take the package or envelope, check the address, then put it in a pile to go to a distribution center in the appropriate, proximal zip code of its destination. That done, the mail might wait up to a day to be flown out, two days at times, then another day to be delivered by ground.
Some breeds of dogs have a natural curl or bend to their tails. But others have been selectively bred to take this curl to an extreme, cork-screw shape. Dog breeds with curly tails referred to as screw tails include Boston Terriers, Pugs, Bulldogs and French Bulldogs.
You may be surprised to learn that your puppy's curly tail can help you figure out what breed of dog he is. Puppies with curly tails often have specialized breeding that goes back several generations. The curly tail is a unique feature of a handful of different dog breeds. Pug Pugs are a toy-size breed of canine with tails that curl upwards rather than hang down. The tail should be set fairly high on the dog's rear and some pugs have tails that curl twice rather than just once. Pugs have broad heads, large dark eyes and short, almost smushed-looking muzzles.