So today we got a new puppy (a maltese chihuahua mix) and we already have a border collie. But our border Collie is very territorial and doesn't like other dogs. How do we introduce them? They are both female's. as you can tell by the breeds there is a big size difference. The boarder collie has always been a outside dog that comes in our house occasionally and the Maltese is going to be a inside dog. What do you all think? What are your different opinions? We heard to introduce them at the park because if our the Collie meets another dog AWAY from our house. She's fine So do we go to the park separately then introduce them at the park and then bring them back together? Tom, I know you train dogs professionally, help me out