Beaver, Schmeaver

Gab: It's an animal with a long tail and builds dams.

Argie: A beaver!

Gab: When you don't bring it with you, you...

Argie: Leave it! Leave the beaver!

Gab: No!

Argie: Leave the beaver at home?

Gab: Add a preposition!

Argie: Live on the beaver?

Gab: That is so wrong! Do you know what a beaver is?

Kodi: What are you, crab lice?

The word to guess is "Leave It To Beaver".