When I was a kid I remember seeing a movie about an alien who comes to earth and befriends a grumpy old man. Deciding that the man is lonely the alien finds a stray dog in a field and takes it to the old man to be his companion. The old man mistakingly believes that the dog is also from outer space and refers to it as "Moon-dog." For the life of me I cannot remember the title of this film. Can anyone help?