Cause he's a dog.
An old faschund.
There were too many vets.
What did they chicken say to his friends after being sent to the hospital after failing to cross the road ?. Don't worry ill get over it.
He had no guts!
He took the chicken's job.
A slippery customer.
Cause they struggle to put food on the table
Cause it was invented in Alabama! Inspiration came from the comments(http://mobile.reuters.com/article/idUSKBN0GP1NS20140825 irpc=932)