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.
The poor thing! This sounds painful. Is she able to stand? (It sounds so but I want to confirm she has no obvious hind limb paralysis).
There are many possible reasons for why she cannot bear weight that can range from rupture of her cruciate ligament in her knee (parital or complete tear) to hip luxation to fracture.
You must gauge if you think she is so uncomfortable that you need to rush her in to be seen this evening. If you feel like you can get her through until first thing tomorrow, then that may be easiest but she is going to need to be seen. Do you have any pain medication left over from a previous problem for her at home?
I am reluctant to recommend any over-the-counter medication, if you plan to have her seen as anything I may recommend will interact with what you vet may prescribe. The only thing over-the-counter that you may use safely is aspirin and it is not that great a pain relief, anyway. But if you would like a suggested dosage of buffered aspirin (enteric coated), then please tell me how much she weighs.
If she was my patient, at this weight you may safely give 1 adult-strength buffered aspirin every 12 hours for pain. And please alert your veterinarian that you gave this, if you have her seen tomorrow.
You are very welcome.
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