Dog style
From BeastWiki
Dog style refers to a sex position often seen in animals especially dogs. Dogs usually assume this position when they start to mate. In this position, the receiving partner bends down on all fours with slightly arched hips to accommodate the penis of the penetrating partner.
This is done the same way in bestiality. A receiving participant bends over on all fours and accommodates the penetrating participant from behind. Actual penetration may be vaginal or anal. Once the dog penis inside the vagina or anus, it will hump until it ejaculates.
This position may also be called rear entry, doggie style or doggy style.
