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Hello this is Dr. Holloway but you can call me Dr. H for short. I am sorry to hear about Sara's current medical issue with the swollen shoulder. Based on your description swelling indicates the muscle is involved and this is concerning because arthritis does not usually cause swelling of the muscle for say. Arthritis is usually limited to the joint of the pet. I would be inclined to do an x-ray of the limb at this point to look for other causes here involving the bone itself. This is the only way to know for sure if this is arthritis or something else entirely.
Also what medications did the veterinarian put your pet on?
- Dr. H