The character of Splat was created by the Englishman Rob Scotton. He’s the hero of several children books.
In his first story, Splat goes to school for the first time. He’s a little afraid, then to feel reassured, he takes his best friend, Seymour the pet mouse, with him.
But releasing a mouse in a cat school causes a certain agitation …
What happened to Seymour ? Why is Splat delighted to go back to school the next day ?
To know that, read the book ! And for the most impatient, we found the story told in English :