20 month old cocker spaniel has just started limping - it's not all the time but she starts walking and then limps. I've tried moving the foot, leg and hip and she doesn't complain, and I've just seen her scratch her ear with that leg. Still limping though! I haven't taken her out for a walk today as I'm so worried that it will cause damage, and she's acting like I'm the worst owner in the world! Help!