One of our herd members is a very sweet, 2 foot tall mixed breed. He has been neutered for the past few years. One of the reasons that we did this to him was to assure us that he would be staying in his own yard and out of others' yards. For the most part, he has been pretty good at this. But once in awhile, he felt the "urge to travel". Though he only traveled in a range of just a few city blocks and is not in the least bit, a mean dog, no one really worried too much about his roamings. That was until a couple of years ago when a new neighbor moved in. Whenever Brutus strayed from our yard, she called out the posse to round him up!!!
It didn't take us long to realize that whenever he was not in the house, we needed to make sure that he stayed in our backyard which has a 6 foot tall fence around it. Common sense tells us that we should not have any problem keeping him where he belonged because that short of a dog had little chance of jumping it. Our only thing that we needed to do was to make sure that we never let him out of the front door. Normally, that is not much of a problem. Occassionally, he does fly the coop.
We've loaded up to go find him and bring him home but normally never find him. Eventually we realize that he is in the back yard where he belongs. When I first discovered this, I just assumed that Stan or one of the girls had put him out there. Come to find out that when they found him there, they also assumed that someone else had put him there.
But recently, we went out to find out where he had dug a hole to channel him from in and out of the fenced in area. No holes were found. For the lives of us, we had absolutely NO idea how he was doing this. FINALLY, we found out that our neighbors to the north of us had some stuff piled up against our fence that cuts through our yard and theirs. Come to find out, whenever Brutus decides that it is time to come home, he goes into their yard, climbs up on their stuff and takes a leap! LOL!!!