Our greyt girlie has pulled a muscle in her left front leg. I kept her in for a couple of days and am now taking her out for very short walks until she stops limping. She now doesn't limp when in the house but when outside every time she sees someone coming she starts to limp and if they are anyways sympathetic she almost needs a zimmer frame. She isn't as bad as one dog we had who used to pull a .leg muscle regularly but who could never remember which leg was affected so his limp was interchangeable. Any ideas why dogs do this apart from the petting and sympathy gained?