I don't have experience here either. But since you said the vet said her knee is a bit tight have you been massaging the leg, or tried a doggy masseuse. As a runner myself I have a friend who is a therapy masseuse massage my legs every once in awhile and it does wonders. She could have maybe pulled a muscle one day, they just go used to lifting her leg up.
I want to put Draco in agility at our local ZoomRoom when he gets to be a year, so please keep us updated anything would be helpful.
__________________ Lana  , Draco 
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