Welcoming in a new dog into your home can come with some responsibilities, especially if you already have a dog. Dogs can react differently when they see a strange dog come into their home since it is what they consider their territory. While some dogs are very friendly and will be thrilled to have a new addition to the family, others might feel uneasy, distressed, or aggressive.
Knowing the dogs’ nature before would be easier because generally friendly and social dogs will react positively with another unacquainted dog. If, however, you are unsure, it is best to take precautions to ensure that the dogs will get along well. A good starting point would be to choose a meeting location that is neutral to both of the dogs. A place that neither dog has visited before, as an attempt to minimize territorial aggressiveness.
Lastly, if the dogs seem perfectly fine with each other’s company, unleash them at the dog park or a safe place and let them interact with each other freely. When taking them home and introducing them there, try to make things neutral for both. It might be best to let them eat separately first until they become friends to prevent conflict.
If for any reason the dogs aren’t getting along well, and are causing any trouble, it is advised to seek a professional trainer that has experience with these issues.