Cats

Purr-fection Unleashed: Cat-tastic Comedy in 'Dog Eat Doug'

in the first panel of today's free comic strip, Sophie the chocolate lab watches two mices carry a pie.
In the second comic strip panel, Sophie confronts the cats and asks why they didn't do anything about the mice.
In the thrid comic strip panel, the cats respond that they did. They filled the pie with helium.
In the fourth comic strip panel, the cat says floating mice are much more satisfying than eating them.

This is how you know your cartoon characters are alive. I would never in a million years come up with slipping helium infused pies to mice. That’s the fun of writing, as you get to be as surprised as your reader. Plus it helps having two crazy cats in real life.