I thought about trying one with Tortilla since she was declawed by her previous owner and could only be safe outside under extreme supervision. But we figure she never has tried to follow Heidi (the dog) outside or us either so why tell her there is a world out there? I had another declawed cat from the shelter that was impossible to keep in. It was a very stressful situation for me and her. She thought she should be outside and never understood why she had to stay indoors.