this could be a sign of luxating patellas. It may seem to bother her one minute and then she could be fine the next. this is because the patella is popping in and out of place. when she's 'fine' the patella is where it is suppose to be and it doesn't bother her. when its out, she is holding the leg up. Its quite common in small breeds. I would take her to your reg vet to have her evaluated and then a specialist if you vet thinks she has LPs. Depending on the grade of the LP she may need to have surgery done. Hitching the leg up and walking on three legs is a sign on pain. Usually when they are doing this they are grade 3 or 4 and need to have the surgery. Grade 1 or 2 can usually wait unless the dog is showing signs of pain or discomfort.
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