Dog

[rebbonk]

This morning my dog looked at me and then said "Tell me a joke"

I replied "No, you don't understand human jokes"

"Oh yeah, because humans are just so clever and I'm just a stupid dog?" He complained.

"Ok" I said "Knock Knock"

Then he ran off shouting

Spoiler:

"It's the door, it's the door, quick, quick, somebody is at the door!