Why you can never tell a dog a knock knock joke

[Because...](https://scontent-sea1-1.xx.fbcdn.net/hphotos-xtp1/v/t1.0-9/11951929_1024791097552124_6723724955112904216_n.jpg?oh=1eceed16c7de9207fcb4d8f426b64c00&oe=567F2A9C)

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