Who said "I think being a dog is the best thing ever invented."?

This quote is attributed to Snoopy.

I think being a dog is the best thing ever invented. - Snoopy

"I think being a dog is the best thing ever invented."

Snoopy Happiness

"I think I'm dying. Send for a doctor immediately!"

"Rats! Another day, another disappointment."

"Sometimes I lie awake at night and ask, 'Is life a multiple choice test or an essay?' Then a dog barks and I realize it doesn't matter."

"I love mankind. It's people I can't stand."

"Babalú!"

"My greatest joy is making people smile."

"Laughter and love make a home."

"The best things in life are free."