Chupacabra in Cuero, Texas

[Tonguez]

The sightings don't look spiderlike, either. It's four-limbed, with the capacity to move on all fours or bipedally.

Could be a common mutation of coyotes (do they have coyote in Puerto Rico?) exacerbated by cross-breeding with common dogs. Perhaps a mutation of the jaw means they can't chew and so have taken to licking blood (and carrion), the bipedallism could be explained as a hopping gait rather than true bipedalism

 

[LightPhoenix]

With the hind legs, it almost looks like a melanistic hyena, though I doubt that's the case. I would guess some sort of mutated or diseased dog, though it's hard to tell from the pictures. The fact that they were all found in the same place suggests disease, maybe exposure to radioactive or toxic waste. However, I wouldn't rule out that they're all from the same litter with a common mutation.

Blood lapping is a perfectly normal activity for any dog, or canine, or carnivore. A mutation in the jaw or teeth could stop the animal from eating, but without seeing the animal's mouth open it's impossible to tell.