A woman who has that slutty/sexy look who as soon as you look at her, you know that she likes it on all fours...you can just tell she loves it doggy style, hence the name a dog woman. Dog woman tend to confident with their bodies and just want it hard.
The best celebrity example is Gwen Stefani. She is not the hottest girl out there, but you can tell in one second that she loves doggy style...maybe even begs for it.
Mitch: "Hey Zack check out that girl at the other end of the bar drinking the apple martini. She looks naughty."
Zack: "Dude, she is definitely a dog woman, no doubt about it."