Suddenly bringing a new dog can make serious problems that can last forever. Dogs are territorial animals and the resident dog might feel threatened and can act very hostile. It’s the best to meet dogs in the neutral territory (to take them together for a walk and to see their reactions). Neutral territory is not the park where you already take your resident dog for a walk; it’s the place outside your house like a training center, neighbor’s yard or some other ‘new’ place. If they two get along very well, you should take ‘the new’ dog in a short visit to your house. You should keep both dogs on the leash for a while and to walk them through the house or yard. Let your new family member meet and explore his new environment. Before the dog visits his new house, you should hide all the toys from both of them and later when they start to feel relaxed and calmed you should give them some snacks. Your dogs should meet slowly and carefully. In the beginning, you should feed them in separate rooms in order to avoid their aggressive reactions. If your resident dog feels insecure and starts being aggressive, the idea of punishing him is not a good idea at all. If your resident dog is already appropriately socialized, there shouldn’t be any bigger problems and they two will surely establish a good relationship. In the beginning, you shouldn’t leave them unattended, and if despite your efforts your resident dog doesn’t want to accept the new ‘buddy’ and refuses food, maybe you should considering of returning him to the breeder/shelter. Bringing the second dog into your family should be your definite decision, so you need to be objective and to think twice before making it. The health of your dog should be in the first place. Only you know his character and nature, and forcing him to live with the second dog and sharing his space can be really stressful. Imagine that you live with someone who annoys you- it wouldn’t be such a great idea. Listen to your dog’s body language, because it will relieve you all his emotions and needs!