We got our little one, Jetta first. she was 6 weeks old (yup, too young, now I know) We waited until she was about 3.5 months old and got Bo, who was 9 months at the time. We introduced them at the park next door...Jetta really liked Bo...Bo had some growling and snapping (with no contact) issues...we decided to try it out for a week and then go from there (previous owner, really needed to get rid of him and offered a trial basis). The first couple of days were pretty rough. (This was Bo's third home in a month, so I feel he was just stressed out from all the shuffling). Bo was very annoyed with little Jetta...he growled and would snap if she took his toys. We corrected this behavior, and by the second day, they were already wrestling and boxing. Bo still has a little bit of toy aggression...but mostly when Jetta snatches his toys...he "defends" them while playing. It's actualy pretty fun to watch.
As Bingasmom said...we were terrified that big boy Bo would hurt Jetta while playing...it actually was the other way around...she, like Bear likes to latch on to lips, cheeks and ears and not let go, lol. those little pups can sure hold their own.
I have a male/female pair- it's worked out great, we've had the two of them for about 3 months now. No real fights, constant play...and now Jetta doesn't stalk me 24/7....they keep each other company, they entertain each other...BUT...they still LOVE attention...they are still momma's babys...if I call them, they stop playing and come right to me for loving. They love to snuggle after a good romp (now that we have two...they actually get tired out enough to snuggle). and they are just a joy to have. My husband never owned a dog before my babies. we started our dog family the day after we got married. I'll admit he seemed a little annoyed by how needy Jetta was for attention. He was worried about getting Bo...but I kept telling him that Jetta really needed a playmate after seeing her with other dogs and puppies. I let him make the final decision...Now he tells me almost everyday how glad he is that we got Bo, lol!