Last February, investigators in Phoenix, Arizona swooped down on Keith Keifer, 47, and Patrick Trejo, 25, after they posted ads on Craigslist looking to connect with dogs owners offering their dogs for sex with humans. Like folks jailed for sex with goats and horses, Keith and Patrick are sick. According to court documents, a detective posing as a dog owner responded to Keith's ad with the headline "Beasty Boy Looking for Dog Knot." Police exchanged emails in which Keith asked for a photo of the male dog's sexual organ. He received it and responded he "liked it very much," paperwork alleges. Similarly, Patrick posted an ad reading in part, "Really wanna get knotted and bred like a [expletive]. Hit me back if you have a pup to play with!" During his email exchange with the detective, Patrick specified a male dog, not a female dog. This afternoon, Keith pleaded guilty to conspiracy to commit bestiality. Patrick pleaded not guilty.