Yea they are a pain, my bitch had a few runs and came back lame, after a few days she was walking fine but if u stretch her leg forward it's very stiff compared to the other side and sometimes she starts yelping, I've was told to keep trotting her and have done every other day for the last 5 weeks but it still seems the same, can't understand it, heeeeeeeeeeeeeeelp!