Since having my little pup I have socialized her as much as possible with people and other dogs. She walks every night off leash with a group of 6 dogs as well as meeting new dogs every night too and has been fantastic. But tonight another dog came running over very excited and just went to smell her and jumping around my pup sounded as though she was being killed. It was the most blood curling noises I have ever heard. It was really out of character she has never done this before and had even met and played with the dog before. She ran behind my legs the owner came and put their dog on the lead. Another dog ran off after hearing the sounds. Why do you think she did this what should I do in future as the dog had done nothing but go smell her?