Because dogs can't whistle. (X-post from r/dadjokes)
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A subwoofer! Now again: What do you call a dog in a sub? Chinese food!
He had Barkinson's
They are both trying to find their X and they don't know Y.
X-Men.
He heard the reception was going to be terrible...
Because they're all dead.
Three. One to post it, the second to post a better punchline in the comments, and the third to complain that it's a repost.
To prevent them from whistling.
There was a face off at centre ice.
Impatient OC from r/dadjokes
Because they have a hard time puckering their lips the right way.