I don't think Disney thought about that at the time.
Like how Mickey (a mouse) has Pluto (a dog) as his pet but Goofy (a dog) in his circle of friends. Goofy is anthropomorphized so he walks, talks and wears clothes but Pluto doesn't wear anything except a collar and can only bark. Goofy has even been known to take Pluto out for a walk.
What were they all smoking back then at Disney?