Texas?
I say it’s a coyote.
Maybe I’m missing something in the stories, but I don’t see any reference to an ID by either a biologist or a zoologist.
The witness in the link in the OP was a farmer.
From the second link you posted, neither Devin McNally, a rancher, nor Stacey Womack, described as “an animal lover”, are biologists or zoologists. Note that it says that Stacey “spent twenty years working with a veterinarian and as a zookeeper for five years.” She was not a veterinarian herself - she could have been the receptionist - and you don’t need a degree to hose out cages at a zoo. This does not indicate to me that she necessarily has any real expertise in identifying animals. In fact, both Devin’s and Stacey’s comments on the possible origin are pretty absurd. It looks to me like the reporter was exaggerating Stacey’s expertise to improve the story.
In the third link, the occupation of the witness is unidentified.
In the link **Q.E.D. ** posted, John Gramieri is described as “the Curator of Mammals at the San Antonio Zoo.” While this is a little better, a “curator” at a zoo is basically just a zookeeper. It doesn’t mean that he necessarily has any technical expertise in mammalian identification. It’s nothing like being the curator of mammals at a museum. (This story also transforms Devin MacNally’s name to MacAnally. I would think that if it was actually the latter he would have changed it. 
)
You’d really have to run it by a Ph.D.-level mammalogist at university or a major museum to be sure of getting a valid identification.
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Thanks for that. That looks like a pretty good match: a mange-ridden Red Fox. Check image 24 in particular, which provides a direct comparison of the Maryland and Texas animals.
Too delicately built, and the ears are relatively much too large.