It was raining 'cats and dogs' today, so we thought we'd set a puzzle along those lines!
They say there are two sorts of people, 'cat people', and 'dog people' (i.e. your preferred pet), and you're one or the other, you're not allowed to like both! To be honest, we don't subscribe to such notions.
Cats and dogs are also famous for not getting along with each other. We thought of this recently when a news story broke (see related webpage link). I think in that case, it's definitely Cats 1, Dogs 0!
You're looking for an 'unusual' container. You'll need to bring your own pen. Stealth will be required at the final location at times.