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Hello. Thanks for the question.
This is likely either due to spinal disease or hip arthritis. Either one can lead to some hind limb weakness and occasional falling in older dogs, especially small breed dogs.
I would get x-rays of the pelvis and spine. This will look for signs of arthritis. It doesn't show the spinal cord, but it helps to look for orthopedic issues. Joint supplements can help when there is arthritis present- Glucosamine, Chondroitin. Anti-inflammatory meds (Rimadyl, Deramaxx) can also help in these dogs. If it looks more like spinal disease, then nerve pain meds (Gabapentin) can also help.
Lastly, low impact exercise is great for these dogs. Swimming is the best option. An under-water treadmill with a physical therapy facility is another great idea.
I hope this helps, let me know if you have any other questions.
The Carprofen (Quellin/ Rimadyl) is a set dose. It's 1 mg per lb twice daily.
The laster and acupuncture therapies could be increased to see if that helps. I think adding in some Gabapentin may make her more comfortable.
I would give 1/2 of a 25 mg chew twice daily. I think it works better when we split it into twice daily dosing.
Good, I'm glad things are improving. Thanks for the update.