There Is A Reason..

[1ozzy]

.. dogs shouldn't tell knock knock jokes.

https://ibb.co/Lzck9Sw

[Patsy33]

Haha...

[davebro]

doggone

[Ken4155]

:-)))

[Bazile]

Ok I gonna regret this

But don't geddit

[Old_Geezer]

There is obviously someone at the door; so what do dogs do (instead of finishing the joke) ?

[vulcan42]

The black dog starts to tell a knock knock joke and as soon as he said knock, they both thought there was somebody at the door and start barking..

[Hopkirk]

You're barking, 1ozzy.