The dogs

In a small New England town, a divorced college professor named Alex Bauer finds an abandoned puppy, takes it home, and grows to love it - unaware that at an experimental canine development installation a hundred miles away a very specially bred pup is missing. Then one day a sudden, savage incident drives the dog into the woods, where among outcasts and strays he reverts to the primal instincts of his species, to kill.
A pack of killer dogs sets off a cataclysm of horror which sweeps the countryside.