At first, I thought "Man and Dog 1" would be the sequel to "Man and Dog" because the two were uploaded by the same person. But now I'm not so sure that they both have the same brown dog. The one in "Man and Dog" is definitely a black-and-tan variety. This boxer here is all brown. I think this film's dog's balls are not as black, and his knot isn't as large (though "Man and Dog"'s dog's knot is only medium sized). Once in awhile the reviewer, an avid watcher of porn when not himself making love, runs across puzzles like this. But the most compelling evidence that the same people aren't involved in both films (and there is a helper in this one; what appears to be a dog's nose momentarily appears in the first film) is that "Man and Dog" had a sound track after which, or alongside which, this film falls far short. It's no less explicit, and the dog gets his bitch. But you can't actually watch the knot pull out of the anus from where the camera is. Not much of a knot either, really, but once in awhile my partner doesn't get completely swelled up, and eventually pulls out of me no larger than that. Not often, whew... And there was no overt human sexual involvement with the act of intercourse. The bitch was more like a sheep, lol. This silent film gets a 4.0 on my scale of 5.