Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
With a long-standing lameness this is probably not a sprain/strain because that would resolve usually with a few weeks. Instead, if it has not really worsened I would suspect she a problem with a joint such as from arthritis. However, for a dog of her age I always recommend consider taking radiographs (xrays) just to confirm this is only arthritis because concern for other bony lesions is high (such as tumor or bone cyst or infection-- although an infection, whether bacterial or fungal, would have worsened over the course of months).
If arthritis is diagnosed then at least we can be confident that we do not need to be overwhelmingly concerned and that we can focus our support on this. She may need multiple modalities to provide pain relief (such as acupuncture or therapeutic laser and nutritional supplements like glucosamine/chondroitin/MSM and determing which prescription medications are best between the NSAIDS like rimadyl and gabapentin and tramadol).
We also have other newer modalities of therapy such as stem cell therapy (harvested for a dog's own fat cells) that I have already had done on several patients and is amazing for providing dramatic pain relief to the point the dogs were able to get off the prescription pain relievers.
Please let me know what questions you ahve.
(have, not ahve...sorry for the typo(s))
Ok thanks I will make another appointment and bear these factors in mind at the consultation.