So turns out the tip of my bow is broken, and you can see it in the picture. It's carbon and apparently very hard to break. The teacher was quite shocked that this could happen; they said it needs a lot of force to break.

Does anyone have any ideas as to how it happened?

Also, a friend's cat has been staying with us for a few weeks now. She does not like the cello, but has been a bit curious about the bow, and I put the bow in a kind of hard-to-reach place. Could she have done this? From what the teacher said, I assumed a cat does not have enough force to do it.