Until yesterday, I had two dogs living in two different houses. A 4-month Dobberman puppy and an 8-month half black lab (we don't know his exact breed). Today was supposed to be the day when they finally met and became friends.
I probably started wrong right off the bat by not doing any research and putting them together immediately at the lab's house. The Dobberman was afraid at first but then they started playing. There was a little trouble as the lab is slightly bigger and would kind of tackle the Dobberman, leaving him off balance.
After running around for a while, they begun to play fight. I (and all of my family) assumed this was ok and let them go on. When there was growling and barking we separated them for a few seconds then let them resume. This went on for many hours. Now that it's sleeping time, we are afraid of what they might do to each other without surveillance. The first idea was to lock the lab, but it looks like it won't work.
So, here are my questions on the situation:
Did I do the introduction wrong?
Will I need to introduce the dogs to each other again?
Should the dogs be allowed to play fight?
What should I do in times when I can't keep constant vigilance?