I have always liked the fox in "Mary Poppins".
The design is so appealing and his shapes and forms are very contrasting.
Big ears and eyes, very thin, long nose, skinny neck and legs, huge bushy tail.
Very graphic, but based on real anatomy.
The use of squach and stretch is pretty gutsy, too, as you can see in those few key drawings that show him jump off screen.
Here Milt Kahl is sketching the character in relation to a tracing of Dick van Dyke.
When this picture was taken Milt's mind was already on "Jungle Book", as you can see from the storyboard on his desk.