This is a cheap US horror from 1982 concerning a group of teenagers who go off on a boat trip and end up stranded on remote Dog Island, where they stumble upon a deserted house, and evidence of a strange family and something not quite right about the place.
Savage dogs roam the island, hence the name, and also something else is there stalking them.
One of hundreds of stalker / slasher films made around this time, here we have the usual poor acting and obvious situations of peril and jeapoardy, as a hulking great retard mutant goes on a killing rampage. Not much violence in this one to be honest. Thekills are all a bit tame.
There is some attempt at adding a few quirks to the plot, and some parts of this reminded me of Tower of Evil - 1972, although nowhere near as entertaining.
Basic video presentation. I think this is one for fans of the film only.