My whippet Rosie and I were out walking very early yesterday morning and I was able to let her free run. She is trained to come back to the whistle which she is very good at. Only thing is I blow the whistle to bring her back and I stepped to the side to let her runs pass me. This was so she could run pass me turn and come back but she must have seen me move to the side and was running at breakneck speed and ran straight into my right leg and popped something in the back of my knee. Has anyone else had this with a whippet. This is the second time that she has run into my legs. I am in pain and very bruised so no walk today I'm afraid. She was so excited bless her to run free she loves it. Is it because they can not put the breaks on?