Beware of dog

私の住んでいるマンションでは犬を飼うことは禁止されていますが、それにも関わらず犬を飼っている人は結構います。なるべく目立たないようにと考えてでしょうか、猫の様に小さい犬を飼っている人が多い様です。　今週のジョークはそんな犬についてです。
Upon entering the little country store, the stranger noticed a sign saying "DANGER! BEWARE OF DOG!" posted on the glass door.
Inside he noticed a harmless old hound dog asleep on the floor besides the cash register.
He asked the store manager, "Is THAT the dog folks are supposed to beware of?"
"Yep, that's him," he replied.
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 replied, "before I posted that sign, people kept tripping over him."