I have a girl friend who has 2 big dogs, a Great Dane, and a Boxer, and she lets them do her regularly, she has tried to talk me into trying it, and even though she looks like she is in ORBIT when one of them is doing it to her,I haven't quite gotten up the nerve yet to try it. I've watched her quite a few times and it's really hot, and she gets really wild with them inside her, she says the knot is fantastic, I makes her almost pass out, when he puts it in her, his knot swells, and he can't get out of her and she can't get off him so she just kneels there until he's finished cumming, then the swelling goes down and he can get it out of her,by then she's full of cum. She's trained the Dane to fuck her Missionary, she has a bench that puts her at just the right highth so he will mount her and he gets on her and drapes his paws over her and like lays on her tits and gives it to her. I let the Dane lick my pussy one afternoon, and she's right, it was fantastic, that long, rough tongue goes clear inside you,and that rough texture, after you get used to it, drives a girl insane. I almost let him fuck me that day, but then I chickened out. He sure wanted to. These dogs are as clean as any guy I know, she suckes there cocks and gets them so hot for her that they go nuts trying to mount her. Her B/F helps her, and helps them mount her. About half the time they get her ass instead of her pussy, but she says that's just as good. They just sort of switch back and forth.