Danger! Beware of dog

Upon entering a little country store, the stranger noticed a sign warning, “Danger! Beware of dog!” posted on the glass door.
Inside, he noticed a harmless old hound dog asleep on the floor beside the cash register.

“Is that the dog folks are supposed to beware of?” he asked the owner

.

“Yep, that’s him,” came the reply.

The stranger couldn’t help but be amused.

“That certainly doesn’t look like a dangerous dog to me

.

Why in the world would you post that sign?”

“Because,” the owner explained, “Before I posted that sign, people kept tripping over him.”