For about a month and a half a stray cat has been coming into our open door to come and eat. We can pet him now and we've made him a little basket to lay in and he does. He's come into contact with our other 2 cats and our dog and while there is some growling, there have been no fights. (No luck finding previous owner).
My question is how do we properly integrate this cat into our home so he knows he lives here now, when we have indoor/outdoor cats and we keep our doors and windows opening (when weather permits)? He's stayed in the little side laundry room where the cat food is and only once ventured a little further in. Should we keep him closed in a room for a week or two so he knows that he can stay here? Or just a couple of days? I want him to understand that he doesn't have to leave (I only ever see him in the evening/overnight), but since we keep our doors open, I figure the only way to do that is to keep him inside for a little while?
Advice please? Thanks!