Introduce them gradually. Because both dogs are young, this transition will be a little less stressful for you than if the dogs were older. Introducing pets that are not too set in their ways usually makes things easier.
It also helps that one dog is female; female dogs tend to be more accepting of outsiders than a more dominant male. It is helpful to try to introduce them very gradually. It would be a good idea if the dogs could meet for the first time on neutral territory.
Try taking them to a park or some location that is not on either one of their "turfs." Keep the dogs on leashes and allow them to sniff each other but do not give them the opportunity to fight. This interaction will give you a starting point.
If there is aggression on neutral territory it may be quite difficult to move them in together. It will be very important for you to reinforce the dominance hierarchy once established. This means that when one dog establishes itself as the top dog and wants attention you ... more.
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