Werewolf Series by Guy N. Smith

A Welsh hill farmer imports an expensive dog from the Black Forest of Germany. When this bites his son he promptly becomes a werewolf whenever there is a full moon. Sheep start getting mauled and part-eaten, then people, and . . .

The Black Hill werewolf, Philip Owen, has been dead for a year, and there have been no further outrages. Until now, that is, and the new maulings coincide with the disappearance from his grave of Philip Owen's body. Gordon Hall, the man who caught Owen a year before, returns to the Black Hill to help with the search, and when Owen's body is found, he realises that there is a new werewolf loose.

Margaret Gunn, raped by a psycho in a wolf's costume in Return of the Werewolf, gives birth to an unusually ugly child. He grows up to become a loner, a bully and finally a murderer, as he slices up his headteacher at the age of fifteen. While in gaol he discovers he is a werewolf and on his release the murders start again.