CARACAS, Venezuela — President Hugo Chavez called U.S. Defense Secretary Donald H. Rumsfeld a "dog of war" on Tuesday, saying the defense chief has no business suggesting neighboring countries are concerned about Venezuela's arms purchases. Chavez said it's disingenuous for Rumsfeld to say he knows of no country that is threatening Venezuela, and he insisted that the U.S. is a threat. The Venezuelan leader called on Colombian President Alvaro Uribe to clarify whether he shares Rumsfeld's worries about Venezuela's recent military acquisitions, including helicopters, fighter jets and assault rifles. CountryWatch: Venezuela "If this man is saying that my neighbors are...