The one dog fight

Here is a joke which occured in bar.
One day, a man walked into the bar and asked, "Does anyone here own the rottweiler outside?"
"Yes sir, I have!" a biker man standed up and said. "What happened to him?"
The man told sadly:"Well, I think my Chihuahua killed him just now……"
"I can not belive it, what are you talking about?!" the biker disbelievingly said, "How could your little Chihuahua kill my rottweiler?"
"uhhh……, it seems that he got stuck in your dog's throat!"