I think Peter should have a cat. It eats all the rodents that sneak onto the Tundra, so Peter lets it stay. He insists it isn’t actually his cat and it’s just there to be useful, but he puts out food for it sometimes and doesn’t fuss if he wakes up to the cat sleeping on him and he’s thrown someone into the Lonely for being mean to the cat at least once. He’s resistant to naming it, so he just calls it The Cat. The ‘the’ is very important, because it makes it clear it’s not HIS cat, you see (but it definitely is his cat).