Because they have a hard time puckering their lips the right way.
If they are thick, they have a hard time to rise
He was a little horse
The Lakers. (Laker fan here. Sorry prob would have been more appropriate last week during the finals.) Edit: I heard this some where the other day. I can't take credit for the joke.
He heard the snow blower was coming.
His lips are moving.
Because dogs can't whistle. (X-post from r/dadjokes)