Good Morning and welcome to Just answer. I am Dr. Loretta, a licensed veterinarian and I am happy to answer your question.
Even though your girl is not that old, this weakness could be due to either arthritis or due to a neurologic issue from delivery of kids. The best thing to try is to give her aspirin at 3 mg per pound every 12 hrs. Do this for 7 days and see if this helps this weakness. If it is neurologic, there may not be a treatment but usually inflammation is the cause for thsi weakness and the aspirin will reduce this inflammation releasing the nerve supply...it is worth a try...
Does that make sense to you?
Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please Reply so I can clarify for you
Sincerely, Dr. Loretta
thankyou for your help.I had considered arthritis ,so i'll give the aspirin a go.
thanks again colin