Pack Leader (pack of what?...)

You're looking at Chancey, a pet duck that roams both indoors and out in a cliffside house in Malibu. The duck was born at an elemetary school classroom and adopted by this family, whose other pet is a Cheapeake Bay Retriever. The duck follows the dog around, thinking she is also a dog and a part of his pack; you can see the dog's tail and paw at the left of the picture.