Jekyll and Hyde (2015)

S1E5 Black Dog

Robert learns about some distant relatives and, along with Max, sets off to a secluded village to uncover more about the Jekyll curse. Upon arriving, they find the community shaken by a series of strange deaths, with residents convinced that a mythical demonic dog is to blame. While investigating, Robert stumbles upon an old book that hints at a link between his family and Tenebrae, leading him to suspect that they might be facing a shape-shifter.