Ask a Dog Vet and Get Answers to Your Dog Health Questions
I am sorry to hear what happened to Maggie. My name is Rebecca. I am a veterinarian and will do my best to help.
It is good that an Xray was normal. That rules out a broken bone, but does not tell us much about the joints, ligaments, cartilage, tendons, muscles, or the soft tissue of the leg. Was your vet able to determine if the problem was in the foot, the knee, the hip or her lower back?
An MRI might be a good idea; it is a good way to look at soft tissue, but you first want to localize where the problem is. One of the most common injuries in the back leg is to partially or fully tear the ACL, the anterior cruciate ligament in the knee joint. If I could, I would compare her right knee to her left to see if there is any difference or swelling in the right knee. I would check all the joints, and compare each with the opposite normal leg.
Has any pain medication been tried? Does it help at all?
I hope you were able to see my answer. Let me know if I can help with or answer anything else, and if this was helpful.