I have 15 chis and chi mixes. All of mine get along quite well except my very old man that was neglected and abused before I got him and Deliah who isn't extremely friendly either but does have a few dogs she loves to curl up with. When I get each new one I sit in my computer chair with the new one in my lap until the pack loses interest, about 15 minutes to a half hour. Then I lower the new one for a group sniff for a few seconds then lift it back into my lap. I do this a few times until my dogs lose interest, then I let the new one go. Never had any problems. Chis love other chis and are pack animals. I see them all the time all piled in a bed and grooming each other. I would do the same with a baby, too. Babushka was about 14 weeks old when she was introduced, took a half hour total, then she has always ran with the pack. I never even set up the pen for her. All the other dogs except my old guy and Delilah love her to death.
