I had a contractor build a outside run off our back door also for our 2 savannah cats, it was put up last august and is 25 x25 with a pond and cover and faces a large woods , now that our 2 cats have seen the outdoors the male is now a darter at the back door to the deck , before the outside run I tried to leash train them but it didn't work out, the female is outgoing and friendly and puurs like a chainsaw but when we put a walking jacket on her she turned into a chainsaw and we never tried again with her , the male in the avatar did wear the jacket and I took him outside along with a long teaser toy and got him to play with it in the yard so he would have a positive feeling about the outside but walking him didn't work, he would not fallow me so I let him go where he wanted, he headed for the woods and after the first thicket he took me through I had enough, tried a few more times but it was the same, both cats like the run but I think it turned the male into a door crasher , the female has not dashed at the door but we are very carful now at the back door