Might have been this feller, first sighted around San Antonio College:
In the mid '70's there were several sightings in south Texas. It wasn't called the chupacabra then. Only later did we hear that term. I saw this with my aunt. I was pregnant with my first child and we were both stone cold sober on her back porch talking about having babies. There had already been sightings in south San Antonio and we had made fun of these for the duration of the time they were reported. It was night but it was well lit by the moon. Behind their house were several acres of pasture where they kept horses. We saw the thing rise from the pasture and fly toward us. There was an awning over the porch. The thing flew so low that it's feet barely cleared the awning. We sat and stared at where it had been and then at each other for several seconds before we could think what to say. Of course the next morning no other family members believed us.
Might have been this feller, first sighted around San Antonio College: