An unusual fitness practice whose adherents believe strengthens the bond between dog and owner has taken hold among devotees of the two- and four-legged variety.

"Dog yoga" — which, as the name suggests, incorporates dogs with aspects of the ancient exercise discipline — lets owners spend quality time with their pets while enjoying exercise, its practitioners say.

"Take a deep breath, and feel the warmth of your dog." Ayu, who teaches dog yoga in the Kichijoji area in Tokyo, says as she begins a class. Held in her arms is her buddy Candy, a 6-year-old female Pekingese.