After existing with one dog for some time you have come to a decision to introduce a second into the family.
When you have selected the dog, introduced him to your present pet and offered him a place in your home you will need to deal with the logistical side of bringing him into your family. This experience will be perturbing for everybody so must be approached and carried out in a positive way.
The 1st and most important thing is that your existing dog mustn't be mistreated or in jeopardy in any way. The dogs should have already met before a home is offered. No tension should be obvious and the 1st meeting should be on neutral ground. The dogs should be noted meticulously and their body language monitored. Positive interaction is important between 2 dogs that are going to live together.
The nicest thing to do is take them both for a stroll before bringing them into the home together. The home should have already been prepared by the removal of any resources that could cause conflict. Food and toys should be removed from all areas initially. Depending on how well the dogs get on toys can be reintroduced very fast and quietly. It's way better to have a giant choice of toys than one; a single toy can be accepted as extraordinarily precious to a dog that's inclined to resource guard.
Research and preparation is how to choose a dog which will successfully become your second family pet. Observation and further research will allow you to manage a positive settling in period.
It is important to think about your own behaviour towards the dogs. Remember that you're also considered a resource. It is going to be natural to worry about your existing pet but do not leave either dog out of interactions. Some new dogs benefit from being left alone to settle and join in noiselessly, others need to interact with you. To stop stress developing it is important that you treat both dogs, when they ask for attention, in precisely the same way.
For more great info on how to choose a dog, or if you would like to find out more about dog training in general, please feel free to visit the Dog Trick Academy.