Fat cat sat on the mat (Harper Collins Publishers)

When Wilma the witch leaves her pet rat and fat cat at home alone, they get into all kinds of silly trouble. The fat cat takes the rat's place on top of the mat and won't get off. The rat and his friends, a bat and a hat, try their hardest to get the fat cat to move--but to no avail. Only Wilma can sort out their disagreement in this hilarious story. Full color.