Okay my buddy calle dme and said someone dumped a dog out and asked if i wanted it. I said sure as I had none at the time. She appears to be about 3 years old. She is a big black lab female. She will come when i whistle and let me pet her but if i raise my voice in the least she runs to the pen i set up for her. My wife let her out of the pen yesterday and she ran from her. Any ideas or tips that might could help me?