The answer to the riddle "What does a dog do that a man steps into?" is pants.
Panting is normal for dogs because healthy dogs pant to regulate their body temperature. Men pants on the other hand, is one of the most essential pieces in a man's closet.
See The Biggest Joke Book Ever by Jack Jacoby - an amazing collection of thousands of jokes (great for any occasions or just to get a great belly-laugh).
Enjoy funny collection of dog humor from links below:
www.rd.com/jokes
www.jokes4us.com
www.short-funny.com
Tip! The Guardian shares tips on how to tell jokes like a pro.