From the website:
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.”