The Munsters (1964)

Season 1: Episode 16

Herman takes the family on a camping trip in a national park. After a dinner by the campfire, Grandpa hears the howls of the wolves and remembers his days in the old country. The next morning, Grandpa is missing. Lily realizes that he changed himself into a wolf to roam the woods with his canine friends. When she hears a news report about the capture of a rare Transylvanian wolf, Lily goes to the authorities to reclaim her father.