One day, a man is out walking a little yellow dog, and he's confronted by a guy with a German Shepherd. The man says, "I bet my German Shepherd could beat up your little yellow dog." The guy with the little yellow dog says, "Bring it."
The German Shepherd starts to beat up the little yellow dog, but then the little yellow dog eats the German Shepherd. The man that had the German Shepherd goes off, crying.
The next day, the same guy is out walking his little yellow dog, and he's confronted by a guy with a Doberman. The guy with the Doberman says, "I'll bet that my Doberman could beat up your little yellow dog." The guy with the little yellow dog says, "My little yellow dog can take him."
The Doberman starts to beat up the little yellow dog, but then the little yellow dog eats the Doberman. The man that had the Doberman goes off, crying.
The day after that, the man is out walking his little yellow dog again, and a man with a Rottweiler confronts him. "I say my Rottweiler can beat up your little yellow dog." The guy with the little yellow dog says, "My little yellow dog is tough enough."
The Rottweiler starts to beat up the little yellow dog, but the little yellow dog, again, eats the Rottweiler. The man with the Rottweiler is shocked, and asks,
"What kind of dog is that, anyway?" The man replies,
[spoiler=funny]"Well, before I cut off the tail and painted it yellow, it was an alligator."[/spoiler]