I'm looking for a fairly old horror movie where a couple finds a manatee washed on shore while camping with their dog.

When they wake up next morning they see the manatee next to them.

They run away from the camp and see that all other campers are dead.

They try to run but find themselves in the loop with no exit.

Long Weekend (http://www.imdb.com/title/tt0079482/). It was remade in 2008.

Thank you very much mate! This is the film I was searching for.

You're very welcome.