Monster Dog

Monster Dog, also known as Leviatn, The Bite and Los Perros de la Muerte, is a 1984 Italian horror film written and directed by Claudio Fragasso and starring Alice Cooper and Victoria Vera. It was filmed in Torrelodones, Spain.

The drive comes to a halt when Vince hits a German Shepherd with the van. The crew cannot stand to watch it suffer in pain, so Vince puts it to rest by killing it with a large rock. While the crew mourns the dogs death, an old man in bloodstained clothing attacks them. He warns them that they will all die, except for Vince. The old man then runs into the woods. Vince and Sandra chase after him to get him to a hospital.When the crew finally arrives at the house, Jos is nowhere to be found. Vince is worried about what happened to Jos, so he takes a shotgun and searches around the house. While the crew waits for Vince to return, they discover the food for the party. After searching the house, Vince gives up and wanders into a room where he discovers a book about werewolves. ........

Source: Wikipedia