Bertie is thinking. Earlier on he discovered the (clean) cat litter and decided to investigate it more thoroughly.
First he tried eating it but it wasn’t very tasty and he spat it out.
Then he sat in it and thought it quite warm and comfortable but a little noisy for sleeping; the granules made a crunchy noise when he moved, so he jumped out.
Finally, he hopped into it and peed. Now he’s a confused puppy – is he a dog or a cat?
Bertie thinks: Maybe if I have a little snooze the answer will come to me!