Unless the dog has living quarters in an outside Kennel, the house will almost certainly show his presence. Hairs are not the only evidence. If he has a temporarily upset stomach he may not manage to reach the garden before he is sick or has diarrhea, both catastrophes on unpatterned carpets.
Garden fences, other boundaries and gates should be sound enough to prevent the dog from escaping into neighbouring gardens and into the road.
Above and beyond all other considerations, the potential owner must have a genuine desire for the companionship of a dog and the willingness to expend care, affection, and loyalty long after the cute puppy stage is past. Every year thousands and thousands of perfectly healthy animals are rejected as unwanted for one reason or another, many of them having to be painlessly destroyed by welfare socities or private veterinary practitioners. In 1982 alone more than 1000 Old English sheepdogs passed through the hands of the breed clubs Rescue organization when owners discovered too late that the television commercials cuddly dog required constant grooming of the coat.