Dog Brain

Ruth and Paul were enjoying a quiet evening at home when their son Timmy crawled in the door on all fours, barking madly.
“Lassie, what is it?” said Paul. “Did the mad scientist next door switch your brain with Timmy again?”
Timmy barked.
“And he fell down the well?” said Ruth.
Timmy barked again, then looked back at the door, whining.
Ruth and Paul looked at each other and shrugged.
Paul got up, and closed the door.
“Boy was a pain in the ass,” he said.
The new Lassie shed a lot less.
And shat on the carpet less, too.