A man takes his family on a camping trip and becomes convinced they are being stalked by the legendary monster of the New Jersey Pine Barrens: the Jersey Devil.
The kid’s dog goes missing in the very beginning of the film, about 44 minutes in it shows a long-dead almost mummified dog in the woods (not theirs). There’s a pretty long scene that ensues. Later on in the movie the dad confesses to killing their dog.
A baby is drowned before the happenings of the movie but is talked about, theres a scene where their son is seen floating upside down in a pond, presumed dead. He gets revived though.