A question on dog behaviour?

You have two different kinds of breeds and they both behave differently, the Shar Pei is less active and will always be that way, as for the stray dogs maybe the just wanted to play but regardless you did the right thing, but not letting them interact. so I would only take one dog at a time for walks or if you take them both ask someone to go with you, If two dogs fight you do not want to try to stop them, you could get hurt, and adult would be better.