Who said "Scooby's tail wags with happiness when we solve a case."?

This quote is attributed to Scooby-Doo.

Scooby's tail wags with happiness when we solve a case. - Scooby-Doo

"Scooby's tail wags with happiness when we solve a case."

Scooby-Doo Happiness

"Scooby-Dooby-Doo, where are you?"

"Ruh-roh!"

"Like, zoinks!"

"Let's split up, gang!"

"Babalú!"

"My greatest joy is making people smile."

"Laughter and love make a home."

"The best things in life are free."