Ours are inside only except for the outside cat run! We use to let ours come and go via doggy door until things started happening to them. One cat was shot through the ear with a pellet gun. Luckily they were able to remove the pellet with little damage to Gypsy. Then Bailey (I’m sure some of you remember his story) went missing for 3 weeks. We found him in the sewer drain with an injured hip and him unable to get out of it. He too luckily survived, although he had to have surgery on the hip, lost weight, and was dehydrated. We learned our lesson after that…INDOOR ONLY!