The breed was favored by royalty of the Chinese Imperial court as both a lap dog and companion dog, and its name refers to the city of Peking (Beijing) where the Forbidden City is located. The breed has several characteristics and health issues related to its unique appearance. Because of its desirable characteristics, the Pekingese has been part of the development of designer crossbreeds, such as the Peekapoo (crossed with a poodle) and Peke-a-tese (crossed with a Maltese). The other main problems of the breed are eye issues and breathing problems, resulting from its tiny skull and flattened face, and skin allergies (and hotspots). An especially common problem is eye ulcers, which may develop spontaneously. Pekingese may also develop keratoconjunctivitis sicca (dry eye) progressive retinal atrophy, along with glaucoma in which pressure is placed on the eye, leading to fluid drainage in the eye. The leading cause of this is improper development of the eye's filtration angles.
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