Chuprcabra or Texas Blue Dogs? [View all]
I've been sure that these things were mangy coyotes, but this seems to indicate there are other possibilities!
Texas Blue Dogs
Jon Downes travels to the Lone Star State to solve a canine cryptozoological mystery
By Jon Downes

The blue dog stuffed and mounted in Dr Phyllis Canion's fireplace
February 2012
FT280
My search for the blue dogs of Texas began in November 2004, when I visited a farm in Elmendorf, just south of San Antonio, where local rancher Devin McAnally had shot a hairless, blue-skinned canid in July that year (see FT199:4849) (1). He took photographs of it to a local convenience store where one of the customers said that it looked just like the chupacabra that her grandmother had told her about when she was a girl.
Thus was born the legend of the Texas chupacabra. I took one look at the bones of the unfortunate creature and was convinced that it was nothing of the sort. Meanwhile, the Elmendorf beast was discussed widely across the Internet and dismissed as a coyote with mange. Well, I was pretty sure that this couldnt possibly be the answer either, and over the next six years I studied the matter from afar and hoped that I would eventually get back to Texas to investigate in person.
In the spring of 2009 thanks to the generosity of Richie and Naomi West Corinna and I returned to Texas and became involved in the hunt for the blue dogs, as what started as a holiday became a full-scale investigation. Richie and Naomi had already visited Blanco, Texas, where another specimen was languishing in the deep freeze belonging to a local student taxidermist. He took a number of tissue samples, which were sent off for DNA analysis. The results have since come back from the Davis Labs, California: it was a coyote cross; although what it was crossed with proved impossible to isolate.
More with a good amount of factual information:
http://www.forteantimes.com/features/fbi/6298/texas_blue_dogs.html