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Hi this is Dr. Hill. Please give me a moment to type my response. Thank you
From your description of where Totto is uncomfortable, I would be concerned about spinal pain. The spine is rigid over the ribcage and then becomes very mobile over the lower back. The area where the two meet (just behind the rib cage) is a common site for intervertebral disk ruptures. A ruptured disk can be as mild as intermittent discomfort, to more severe with significant pain and lameness in one or both of the back legs. Joint supplements are wonderful for chronic pain associated with osteoarthritis, but will unfortunately not help if Totto has a ruptured disk. I would call a local veterinarian and get him evaluated today. They should be able to tell on a physical if it is back pain and then can get him started on very effective pain medication and anti inflammatory agents. The other possibility is musculoskeletal problems (rupture ligament in knee, arthritis, muscle injury), but that would not explain an issue with the back leg and pain on the side. Please ask any follow up questions. You can continue posting on this thread for a couple of days, even after rating my response. Take Care.
If there is obvious back pain, then X-rays are a reasonable next step to evaluate the disk space and the vertebrae. If there is no back pain but just a lameness, then X-rays of the leg affected is reasonable. It is really going to hinge on where the veterinarian finds the focus of pain. But they should definitely be able to help him be more comfortable while trying to sort out what is wrong.
You are very welcome.