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Hello,Thank you for using Just Answer. My name is***** am a veterinarian and will do my best to help.
I am sorry to hear about your Boxer.
This does not sound like arthritis, and it does not sounds like poison either.
It sounds like there is something wrong with her spinal cord and nervous system. Most of the common poisons cause internal bleeding, seizures, kidney failure, but I don't know of any poison that would affect her spinal cord function. Not being able to stand, the toes curling back sound like the nerve message from the spinal cord and brain is not reaching the legs.
This is most likely either a bulging disc, putting pressure on her spinal cord, or possibly a tumor in her spinal cord. I would consider this to be an emergency and recommend you get her to an emergency clinic as fast as you can. The sooner she is treated, the better chance of her getting back her nerve function.
Let me know how she is doing and what other questions I can answer.
I hope you were able to see my response; I have not heard back from you. Can I answer anything else? How is she doing?