Sino is an anthropomorphic young stag created by artist Furfragged. He first appeared on Furaffinity on July 22nd, 2010 and was named Sino on July 14th, 2015. Sino's images usually are monochromatic sketches, but appearance wise, he is very slender, with light brown, almost red fur, dipstick ears, antlers, and often wears a pink tank top and nothing else. Sino is frequently depicted in a series of pseudo video game overs in which he tries to find a young doe to mate with at a nightclub. He usually becomes to horny and fails, and winds up being seduced by a male, usually an older male, or occasionally a shemale or group of males. The most frequent character that Sino winds up being paired with is a much older buck by the name of Arthur, formerly known as the unnamed_old_deer. Currently, Sino has largely given up on any pretense of being straight, perhaps realizing that he does not need to get girls pregnant to be happy and accepting the fact that he enjoys being buttfucked.

Originally, Sino was meant to eventually be in a romantic relationship with a transwoman named Leslie, but in recent years Arthur has replaced Leslie as Sino's canonical love interest.

Sino is easily Furfragged's most popular original character.