List of Places Where You Can Borrow a Dog

Borrow a dog
Borrow My Pooch matches your pooch with local dog lovers who will borrow your dog for walks, playdates, weekend sleepovers and holiday care.
Facebook: BorrowMyPooch
Cost: $38 a year for dog owners and $38 a year for borrowers to subscribe to service.

Lend a Pet helps you find a pet to borrow because you would love to own a pet, but can't right now, you would like to test whether a pet is right for you or your family, you're looking for a walking buddy, you love animal company, but aren't ready to get your own, your pet would like a part-time friend whilst you're at work or you're looking for something fun (and inexpensive) to do on the weekend.
Facebook: Lend a Pet
E-mail: Send mail
Cost: Annual cost of $49.99

Dogshare is a membership platform for dog lovers. Users pay an application fee and an annual subscription to the service and then members exchange or simply volunteer doggy duties in a cashless environment.
Facebook: Dogshare
E-mail: Send mail
Cost: $20 one-time application fee and $9 per year.