Inky Kruger
Inky is a black cat that lives in 1428 Elm Street with the Mr. and Mrs. Krueger and their daughter.
In "Arthur and the Haunted Tree House", Muffy and Bailey find the cat while sheltering from a thunderstorm in the tomb of Jacob Katzenellenbogan. Inky scratches Bailey, but immediately likes Muffy. His name and address are on his collar, so Muffy and Bailey bring him home.