This is disturbing at the very least and disgusting at the most, so be warned. One of the ER nurses told me this one this morning.
ER Doc: "What seems to be the problem today?"
Patient: "I'm worried I might have chlamydia."
Doctor: "Did you sleep with someone who had it?"
Patient: "Well, not someone, but I've been having sex with my dog lately. My son's girlfriend also has sex with the dog and she tested positive for chlamydia so I'm worried she gave it to the dog and the dog gave it to me. Can dogs get chlamydia?"
I'm going to have to make "Can dogs get chlamydia?" into a t-shirt.