[2][3][4][5][6] Prior to World War II, dogs more commonly lived outside in the United States, but as urbanization spread dogs started to live indoors more frequently.
Other factors, including an increase in the population of adults without children, have gradually led to more attention and money being spent on pets.
[8] San Francisco, another wealthy American city, has also been credited for spurring the dog day care trend.
For example, some facilities provide a cage-free environment where dogs play under the supervision of a trained staff member.
A daycare kennel is a type of facility that offers cages or runs where the dog will be placed alone during the day.