Lone Woof

Lone Woof is a character and presumably a wolfdog who appears in An American Tail: Mystery of the Night Monster. Lone Woof is the second-in-command of the Council of Dogs, a pack of stray dogs that live in Central Park in New York. He apparently is a friend of Nellie Brie, though it isn't explained how they met. Most likely, he helped her on one of her cases.

He is voiced by John Garry.

History
While trying to find out who might be behind The Night Monster, Nellie Brie goes to him for help, taking Fievel, Tony and Tiger with. He at first refuses to help them because he doesn't deal in mouse affairs, but after the four of them sing "Who Will", he is talked into giving them a clue. He points to a missing dog poster on a nearby tree, which has a picture of Madame Mousey on it.

Later in the film, Tiger is forced to go to the Council of Dogs for help because the Night Monster has kidnapped all the mice. It is later revealed that Madame Mousey tried to join the Council of Dogs after running away from her owner, but was kicked out for being too small and irritating. Seeing that Mousey was their problem too and what had happened to the mice was partly because the Council never stopped her, Lone Woof decides to hunt Mousey down, capture her, and return her to her owner.