we added Apple to our family when Chuck was 7 mo old. Chuck is also not aggressive around other dogs but you might say he's a bit shy
When we brought Apple home we kept them in separated rooms for 2 weeks, letting them play a bit longer each day. It's been almost 6 weeks now and they are already best of friends! They play all the time, sleep together, even eat from the same bowl!!!
I was very hesitant to get my 2nd dog but it was one of the best decisions I've ever made... (have to admit already thinking about the third
)