Are there habitrails for larger animals like cats and small dogs? I have an older inside/outside cat, Frank, who loves to potty in the outdoors (much better than outside the box inside!). He's gotten beat up by some strays and I don't want him outside unattended/unprotected anymore. I was designing a flexible fenced enclosure that could lead him from back door to grass and dirt when a neighbor mentioned having seen a habitrail for cats on a some television program. Anyone out there have a link or information on something like this? Any of you create one for your cat(s) and willing to share a photo or design advice? Thank you!