If you are thinking about bringing a cat into the classroom, "Cats Protection" in the UK has developed curriculum that revolves around cats. Or you can say that it highlights how cats can be used to teach curriculum.
Need to get the kids excited about the history lesson for the day? Tell them a cat's role in that time period or place. The kids want proof that math is used in the real world? Have them figure out the cost of owning a cat.
They have a range of activities that allow your classroom cat to be the inspiration and motivation for the kids to stay engaged in the lesson. Just click here to get the PDF.
I wish I could take credit for the idea, but like I said it was created by "Cats Protection" in the UK who have their own blog. I'd love to hear if someone uses anything from the curriculum, or changes it to fit their classroom pet.