Silas Perkins's Sister is a mentioned only character and presumably a anthropomorphic dog or cat.
Description[]
This woman is the sister of Silas Perkins. By 1939, she lived in Stickleville like Silas and had a daughter, Silas's niece. When Mickey visited her house, she was visiting Aunt Gussie whilst her daughter played with the dog on the front porch.
Behind the Scenes[]
Silas Perkins's Sister was only ever mentioned in the 1939 story Mickey Mouse Outwits the Phantom Blot.
Whilst Silas Perkins and his brother are dogs, his sister's daughter is a cat, so it is unknown what species his sister actually is. It is likely that either Silas's sister or her husband is a anthropomorphic cat.