The story begins with Pluto being dragged away from Mickey's home by a dark hooded figure. The fear in Pluto's eyes and body language is so lovingly animated that it makes us wonder how an experienced dog murderer found the time to become a Disney animator, because that's clearly what happened here:
"I can't quite get the panic right. Bring in another model dog!"
After Pluto is captured, the abductor pulls off his hood to reveal himself as the Mad Doctor, a deranged man with plans to attach Pluto's head to the body of a chicken, a complicated surgical procedure requiring a bloody hand saw and absolutely nothing else.
Honestly, every part of this equation is equally confusing.