[quote="M Paul Lloyd"... Ifind no actual account of a creature that can transmute its form from Bat to Dog to Humanoid which also feasts on human blood and calls itself Dracula........ But maybe I'm being too specific?

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Dracula himself was a fictitious character based on an actual bloodthirsty count. His shape shifting abilities were probably Bram Stokers original ideas. Although ancient legends existed of shape shifting people (as described to Herodotus in his Histories), this was a once off thing, not done at will by the creature concerned. Vampire legends, as far as I know, are limited to the dead rising and feeding off the blood of the living. They avoided daylight, and hated garlic. Wih the advent of Christianity, the were said to fear the sign of the cross as well. That's the extent of their common characteristics with the "modern" idea of a vampire.
Vampirism, as a word, is quite recent, dating back only a few hundred years. The concept behind it, of the dead drinking blood to regain some form of consciousness is quite ancient though. Some might recall Odysseus' trip to Hades, where he was instructed to allow the shades to drink the blood of his sacrifices, to enable them to answer his questions.