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Hello, I'm Dr Gary. I've been practicing veterinary medicine since 2007. I look forward to helping with your questions/ concerns.
Is she having trouble with stairs or jumping up?
It sounds like you're most likely dealing with a disc herniation or herniated disc in the back. These are very common in smaller breed dogs. They can cause mild signs of pain and reluctance to jump. They can cause more moderate signs of weakness. They can also cause severe signs like paralysis.
Most dogs we see are as you described, painful and mildly weak in the rear legs. They typically do well with 1-2 weeks of rest and pain management. I typically use a combination of an anti-inflammatory (Rimadyl) and something for nerve pain (Gabapentin).
I would see a vet to confirm this and start the meds. In the mean time, strict cage confinement is ideal with no running, jumping or playing.
I hope this helps, let me know if you have any other questions.