To be truly effective, the old dog must be let out of the cage several times a day to understand the new smell -- though it should only occur after the new dog has played and been put away. The more you do these short routines, the faster they will familiarize with each other.
So when do you know your older dog is ready for a close encounter? He or she will no longer furiously follow around the new dog's scent around your home. This is a dog's implicit way of saying, "Okay, I'm comfortable with that other dog now. When can we meet?"
4. The face-to-face meeting should not, for territorial reasons, occur on your property. A neighbor's backyard, a ball park (when no other dogs or people might interfere), or any other enclosed area are far better places for the first meeting. And please do not think that leashes are sufficient enough to replace the security of an enclosed area; holding the leashes may in fact encite aggression in the dogs.
Instead, let the old dog run around the field (or other enclosed area), while the new dog is out of sight. Then switch and allow the new dog to play in the field while the old dog is out sight. Just like in your home, the dogs will detect a faimilar scent. Since the dogs have already been formally introduced via each other's scent, they are ready to meet face to face. And because the area is confined and safe, they will not have a need or be able to run away. Instead the dogs will run over to greet each other, smell, posture ... and will have no inclination to fight.
This stress-free and safe routine is the best way to introduce new dogs. In fact, it should easily work with trained or misbehaved dogs. You are allowing the dog's natural instincts and primary sense (smell) be the teacher, which is both simple and effective.
A dog's sense of smell is considered by many as its primary sense. Therefore, this training is based entirely upon the scent. This method will easily work with trained or misbehaved dogs. We are working hand in hand with the dog's natural instincts. Allowing the dog's instincts to teach the lesson will make learning simple yet efficient.
Image: Jim Winstead / via Flickr