My 8 month old Lab got up too fast earlier and hurt her arm. I heard a popping sound and now she can't put any weight on her right front leg. I examined her entire leg thoroughly and found that it's her elbow thats causing her pain. But, it only hurts when she puts pressure on it. I tried extending it and putting pressure in different spots but that doesn't bother her. I know it isn't broken because she can still move it when she's laying down. Other then not being able to walk she's her usual happy self. It's almost 11:00 PM so I'd rather wait until morning to bring her to the vet, but will it get worse if I do? I think she might have just pulled something or it's possibly just a sprain, but she is my first dog so I'm not sure if this is something that just happens from time to time or if I should be worried. Any thoughts?