M/S of a little boy (Theodore Bucher) standing in front of a table playing with mice. Mice are running across the table. C/U shot of the boy's hands playing with mice. There are five of them and they are very lively. High angle C/U shot of the mice curled together. C/U shot of the boy's face as he plays.
Music dramatically changes - M/S of a girls carrying a cat (Debby) as she comes into the room. She drops the cat on the table among the mice. Cat starts eating the food from the saucer placed on the table. C/U shot of Debby eating. Mice come to share her food. C/U shot of the mice sniffing but turn away unimpressed.
M/S of the boy and the girl watching the cat and the mice on the table. Cat starts playing with mice but does not get aggressive (at least it looks like it). C/U shot of the cat playing with one of the mice. M/S of a little girl coming with a saucer full of cat food and places it on the table. C/U shot of the cat and mice eating. C/U shot of the little girl's face as she watches them. Great C/U shot of the two mice with their faces up, sniffing - as if they are asking for food. High angle shot of the cat and mice on the table.
Great C/U shot of Debby looking up into the camera. C/U shot of the children's faces as they watch the animals. C/U shot of Debby lying on the table while playing with mice. Somehow, the mice do not seem to be scared.
The boy and the girl keep feeding the cat throughout the film so that could be the explanation of her playfulness without finishing the job.