I don't doubt the idea that it could possibly be the cloning/inter breeding experiments gone wrong by the government, but I do not believe that the "chupacabra" has so called fangs, in which are inserted inside an animals  head (which means that they would have to pierce through the scull of the victim) and used to suck the animals blood for "chupacabra's" source of food.  The blood from an animal, sucked out by the chupacabra, or not, could not be a source of food supply simply because of its lack of nutrients, and the proper vitamins in which a high energy animal, such as the "chupacabra", would need to consume on a steady basis in order to survive. To survive, the animal needs a good source of food in order for it to have enough energy to carry out its daily routine, or activities.