June,
You should introduce new dogs on neutral territory. Let them meet at a dog park or some place that 'belongs' to neither dog. There is more to it than that, but that is the very first rule of bringing in a new dog.
Cesar Milan would probably suggest that, after they meet, you take both dogs for a long walk together. This gives them a chance to get to know one another in a situation where both are obeying you.
Good luck,
kjd
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