Are You Afraid of the Dark? (1992)

S2E9 The Tale of the Full Moon

Two young pet detectives set out to uncover the mystery behind the vanishing neighborhood cats. Their investigation leads them to a neighbor's backyard, where they stumble upon a suspicious stash of cat collars. This discovery sparks their theory that the neighbor might be a werewolf. However, despite their compelling findings, no one takes their claims seriously.