I have a boxer who just started crying over pain in her upper leg area. When I touched her underarm she yelped. She holds her paw up, yet is still able to walk on it, just not very well. She was playing last night, jumped to catch her toy, kind of twisted her body in the process of landing.

She could have torn a ligament, best to take her to the vet for x rays. Not much we can do for you online unfortunately. Your vet will have to give you the okay to give her an aspirin or other pain relief. But it sounds like she is in quite a bit of pain. You might want to make that appointment before she does further damage to her joints.