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What you may be seeing is a patella luxation where the knee moves in and out of the joint, or a torn cruciate ligament. Your Vet will likely want to do a range of motion on the leg while feeling the knee to determine what is going on. A cruciate ligament will get worse the longer it is let go because arthritis begins to build around the area very shortly. This is painful to the dog but dogs are very stoic so many just limp without whimpering or whining. At times they will pull the whole leg off the floor and not bear any weight on it at all
I would take him in as soon as you can. If there is a torn cruciate ,which can likely be determined by the Vet doing a physical exam, it gets bad pretty quickly and makes for any surgery needed a bit more difficult, as I said, the bone then starts to heal/grow toether and creates arthritis.
Here's another good site for torn cruciate
You are very welcome. Hopefully it is something simple but we don't want to play around when it comes to a possible cruciate problem.