"Now you notice how floppy Chad's ears are getting? See the long tail he's happily wagging? Well, normally Doberman Pinscher's ears and tail are trimmed when the dog is a puppy. Chad's a bit older, but we can still snip the tail into the traditional Doberman snub, and clip his ears into the proper pointed version. Now we will need to anesthetize the dog for the procedure, and while Chad is immobile we will vaccinate and neuter him," Rick explained to the class.
"Rooter ree?" Chad asked nervously.
"He sounds like Scooby Doo!" laughed Bruno in the front row.
"Well, Chad's going to be a good boy, aren't you boy? And let Doc Ricky cut your balls off, okay?"
Chad really didn't like the idea, but well Rick was his master and he knew what was best for Chad.
"Row kray," Chad answered in a whiny voice.
"Now Bruno will you help me inject him with the curare."
"Curare? I thought that was for poison darts?" Bruno said standing up.
"Yes, that's right. This is a purified extract, and will make Chad immobile for the procedures. I'll use a local anesthetic on his tail and ears."
"What about his balls?" someone shouted.
Chad whimpered as his nose and jaw pushed forward away from his eyes.
"Aw, Chad, look at it this way at least you won't father any puppies," Bruno said tousling the tiny patch of human blonde hair on the top of the rapidly doglike creature standing naked on all fours in front of the class."
The syringe pierced Chad's right thigh, and he whimpered. His heart rate began to slow, and his breathing became more shallow, as Ricky pointed out the various changing features of Chad's anatomy.
"Notice how Chad's ribs are reshaping his chest? His shoulders are narrowing too, and his torso is becoming barrel shaped...."
"Bruno, as long as you're there. Have you ever jacked off?"
"What?" asked Bruno looking flustered and turning red.
Chad would have smiled if he could have moved.
"Jerk Chad off, and collect his sperm in this vial. It should be human sperm. We'll jerk him off again, just before we castrate him, and then we'll look at both samples under the microscope."
"You want me to give Chad a hand job?"
"Well, yes," Rick answered.
"Oh, sit down, Bruno. I'll do it!" someone else said. Chad couldn't see who spoke because he couldn't move. He felt a hand jerking his cock, and then he saw who was doing it. It was...