I hope this is acceptable for
The premise was to take an existing wild fantasy/sci-fi/orginal species and domesticate it. I tried to find one of my own species to use, but I'd already "domesticated" so many of them that seemed to work for that. I decided to go with chupacabras [link] [link]
because I had thought about it and done a little sketch before, but didn't do anything more with it.
I figured I'd put both versions on the sheet just because I never did a "nice" image of my chupacabra interpretation.
Now for the species description:
Chupacabras were domesticated by farmers to protect their livestock from wild chupas, because dogs were affected by the chupa's nauseating pheromones that are secreted from ducts near the eyes. This is what causes their eyes to glow red. Chupas are not affected by their own species pheromones, and thus could fight off intruders.
Chupacabras are about the size of a medium-large dogs. They are generally quite thin and fit, especially if they are used for work. If regularly fed a diet of fresh animal bodies, they will not attack the stock. The spines on the back are much smaller in domestic individuals, than wild ones. Further breeding is attempting to remove or soften the spines. The "usual" canine domestication traits can be found in the chupacabra, including floppy ears, curved tails, and color variations. Some people have gotten their hands on chupas as "status symbols/gaurd animals" and crop ears and tails. Domestic chupas only secret their pheromones when extremely stressed.
Further breeding could potentially produce many different varieties, like dogs.