here'e the real definition of a "pocket Pet"
From Wikipedia, the free encyclopedia
Pocket pet is a term used to refer to any small mammal commonly kept as a household pet. The six general criteria which qualify an animal to be considered a pocket pet are: 1) its commonality as a domestic housepet, 2) no potential danger to humans or other animals, 3) non-exotic, 4) overall ease of care & feeding, 5)amicable disposition making it suitable as a "companion" pet, and 6) relatively small stature.
The most common pocket pets include rodents such as: hamsters, gerbils, fancy mice, fancy rats, and guinea pigs. It also includes common, non-exotic animals such as sugar gliders; which have been bred as domestic housepets in the U.S. for the last 15 years. According to a recent 2007 study conducted by the American Veterinary Medicine Association (AVMA), it is estimated that American families own 6.2 million rabbits, 1.2 million hamsters, 1.1 million Sugar Gliders and just over one million Guinea Pigs.
Humm I certainly did not see a Yorkie referred to as a Pocket Pet as defined!

Maybe the woman really wanted a hamster, mouse, or fancy rat