No time for a pet? How about sharing one?

Although she has never seen the doggy day care center where Jackpot spends his off-days, Gonzalez recently met another of his part-time companions, graphic designer Jenny Goddard, 33. Goddard, who is married with a 6-year-old son, said having a dog a weekend or two a month has been perfect for her busy family and encourages them to spend more time together outdoors.

"It's funny," she said. "He is so friendly and immediately playful with us, people are surprised he is a rental dog."

The idea of commitment-free pets is not entirely new, although no one in the United States has tried it with as much drive as Cervantes. Most private animal shelters, for instance, encourage volunteers to become temporary foster families to animals awaiting adoption.

For 15 years, the Aspen Animal Shelter in Colorado has gone a step further with a Rent-a-Pet program that allows residents and tourists in the resort town to take dogs out for a few hours or overnight for free.

"It benefits the homeless animals, keeps them socialized and exercised and in the end they end up getting adopted," said owner Seth Sachson. "The people benefit, too. When a tourist walks around town with a dog, they feel like a local."

Melissa Bain, a veterinarian with the Companion Animal Behavior Program at the University of California at Davis, said she had concerns but no hard-and-fast objections to a service like FlexPetz.

On the positive side, it might give people an easy way to test the ownership waters and keep a few dogs from being euthanized, Bain said. Possible downsides would be irresponsible members who treat the dogs like a lifestyle accessory instead of a living thing.

"It depends on the people and it depends on the animal. Some dogs may be fine and some may become stressed because they are moving from home to home," Bain said. "Perhaps they had a good experience with a good part-time owner and then they get shipped back. What kind of message does that send to kids? That dogs are disposable."

Cervantes said the hour-long sessions Flexpetz members are required to spend with their dog and a trainer before their first outing ensures the dogs are going into caring, competent homes.

Her members, who range in age from 5 to 60-plus, include single women in search of security and a conversation starter, Navy personnel who love dogs but are at sea for much of the year, and seniors who live in apartments where dogs are not allowed.

"Usually, our dogs are lavished with attention, and it's undivided attention from our members because it is the only time they have together," she said. "Some people take a dog home and realize, 'Hey, I can adopt a dog.'"

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