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Welcome to Justanswer! I am Dr. Altman and happy to assist you both today!The primary concern is a patellar luxation with her breed and symptoms. I would advise a veterinary exam because a home evaluation will not give this diagnosis, a veterinarian needs to check the stifle for a moveable patella or kneecap which cannot be done without an experienced hand. Often with palpation and manipulation at home you will not see any indications of this conditionHere is more information on patellar luxation in dogs:http://www.petplace.com/article/dogs/diseases-conditions-of-dogs/bones-joints-muscles/medial-patella-luxation-in-dogsUnfortunately in small breed dogs this is very common. Some require surgery while others simply need to minimize certain movements such as jumping on/ off furniture or stairs along with keeping him lean and regular consistent exercise.I hope this information makes sense. It is possible that this is a simple muscle injury but I suspect you would have seen some improvement if that were the case in this length of time. And the fact that it is intermittent, his breed, and the inciting cause really makes me suspect his kneecap.Please let me know how else I can assist you both today, I am online another 20 minutes tonight to assist you both.
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