A Chinese woman says her pet dog has taken to peeing upside down.

Mrs Chen, of Changchun city, says 18-month-old 'Baby' began peeing in the new position just three months ago.

"He used to pee as other dogs do. But one day I found him putting both hind legs up onto the tree to pee," she told East Asia Business News.

"I thought maybe that was only for the one day. But from then on, unexpectedly, he would pee in that acrobatic position."

Chen says Baby's other unusual trait is that he is a vegetarian.

"He can't eat meat because it makes him throw up. So I only feed him egg yolk and corn pancakes, and that's been his main food," she said.