There are two new Halloween films for kids this season: The Dog Who Saved Halloween, sequel to The Dog Who Saved Christmas, and Spooky Buddies, one of Disney's Air Buddies series and following exactly the same plot as Hocus Pocus. Just add puppies.
For some retro canine horror films try Zoltan: Hound of Dracula (1978) and Devil Dog: Hound of Hell (1978). Or the original and best of all the killer dog movies: The Pack (1977).
For an update on an old theme try The Breed (2006).