dog that sucks dick

a guy walks down the street
and sees another guy walking a dog.
he comes to the guy and says: cute dog.
the guy with the dog says:
yes, but you know what,
this dog can suck dick very well.
the guy says: no way!
the guy with the dog says:
give it a try, take your dick out and go to him.
guy tries few times
but each time dog gets very angry
and refuses to suck dick.
finally the guy with the dog says:
sorry he did not suck your dick.
i can suck it instead of him.