Two(free ranged) roosters jumped on my three pound chihuahua and immediately after it occurred she was dragging her left hind leg. From what we can see/feel the joint's not out of place and nothing's broken, but her lower back is extremely sore. I'm bringing her to the vet tomorrow morning, but I'd like any thoughts on what it may be and what I may be able to do for her to prevent any farther damage until I can get her medical help.