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This breed is prone to luxating patellas which is kind of like the knee popping out of the joint. This can be intermittent or permanent. It can range from intermittent skipping to non weight bearing. Your vet will be able to feel the joint and see if it has popped out.
Treatment can be exercise restrictions an and anti inflammatory drugs to surgery depending on how bad it is. Here is more on this.
I saw a product called Comfortis. It comes in various