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If you're adding a second dog to your home, the key is to introduce the two dogs on neutral territory. If you must introduce the two dogs near your home, try an outside fenced area that neither considers its own territory. It may be helpful to get the help of a willing friend or family member. Have your friend handle the new dog on a leash while you handle your first dog on a leash. Allow them to sniff and greet each other. If any tension starts, redirect the behavior towards another activity, like a brisk walk in the other direction. Once the two are comfortable, you can let them off leash to interact and then bring both dogs home.
Keep a close eye on both dogs for the next several weeks and separate them if any aggressiveness occurs. However, let both dogs pick their own pecking order in the home.