Hi Mel and welcome! My cats don't react to my birds, gerbils, or chinnie...I even had a hamster escape 3 times in the past and they just sat there and watched him...they actually helped me find him, lol. I guess I'm lucky to have lazy cats. As said, you need to keep the cats away from your chin and hedgie, but I don't see any problems with having all of them coexisting in the same house.