Worries about Mad Cow Disease

There were these two cows, chatting over the fence between their fields. The first cow said, "I tell you, this mad-cow-disease is really pretty scary. They say it is spreading fast; I heard it hit some cows down on the Johnson Farm."  The other cow replies, "I ain't worried, it don't affect us ducks."

He Sees Red

Q: What kind of dog chases anything red?
A: A bull dog!

Chases Cars

Q: How can you tell if you have a stupid dog?
A: It chases parked cars!