Tick carried diseases can cause joint and muscle pain which is why I asked about them.

It is possible she has hurt her spine and you can read about this here

http://www.marvistavet.com/html/body_fibrocartilaginous_embolism.html

and more here

http://www.westvet.net/Canine%20IVDD.html

If you have not had her checked for hip dysplasia or other joint diseases those could also be impacting her.

But this might be due to torn cruciate ligaments which you can read about here

http://www.marvistavet.com/html/body_ruptured_anterior_cruciate_lig.html

You can see if you can get her to potty outside by helping her stand with a support under her chest - a towel might work to help you hold her up or a harness.

I'd plan on more vet care for her if you can get it. You might need to take her off island to get her the care she needs as I don't know what resources for vet care you have there.

Hope this helps you!

How a dog reacts to a pinched nerve depends on how it is pinched. It can be painful or numbing.

She may not be getting enough nerve impulses back and forth to move the muscles.

Dogs often do not show a lot of pain particularly when the owner is handling the dog.

I had a dog that shattered a bone in the leg who stood there and let me feel it to see if it was broken and barely reacted at all. She cried and tried to bite the vet when the vet handled it but stopped as soon as I held her head. She would put up with pain from me but not a stranger.

She may be dealing with pain by just not using the sore joints.

The neuro vet site lists the loss of back leg use here

http://neuro.vetmed.ufl.edu/neuro/paralysis/para.htm

and considers the two nerve issues the most likely ones.

You are very welcome

here is a site showing some slings to give you ideas

http://www.handicappedpets.com/www/index.php/help-pets-walk/rear-dog-leg-support.html

Thanks for the above accept!