Sylvie & True — David McPhail

Sylvie, a rabbit, and True, a water snake, are best friends. They live together in a small apartment on a quiet street in a big city. Like a lot of best friends, Sylvie and True are different in many ways. Sylvie sleeps in a bed; True sleeps in the bathtub. Sylvie leaves the apartment by going through the door and down the stairs; True slides out the window and down a drainpipe. But, of course, they have things in common, too - they both love food and bowling - and together they make quite a team.
 
Told in four short and easy-to-read chapters, and illustrated in warm watercolors, this is a sweet and funny story about the give-and-take of friendship.