Dog owner takes another dog owner's dog

I have written negatively about some dog owners in my previous posts. I just wanted to say that I am not biased. I was in the park with my daughter and we were playing in a pretty packed playground. A dog owner was playing with a child and the dog was waiting outside. I was busy with my daughter but I noticed that another dog owner was concerned about this dog all alone and decided to take it with her. She had apparently called for the rightful dog owner but without a response. I alerted the incident to the rightful dog owner who had been engrossed in a game with the child. She managed to get her dog back just in time.