on penises:

Okay, so the other oncology hooligans and I were examining a patient being treated for transmissible venereal tumor (TVT). Whenever we see this dog, we pet him, give him treats, and then sit on him and look at his penis.

thanks teenmomtalk.com
Dog penises (as you may know) generally live retracted inside a prepuce. If you want to get a look at the entirety of your patient's genitalia, you need to extrude the penis.

As you might imagine, dogs generally don't like this. Although this dog is very patient with our rude attentions, it's sometimes challenging to get the horse all the way out of the barn.

Our oncologist added some helpful commentary:

Oncologist: "You guys really need to work on your penismanship."

Our response:

thanks warosu.org