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Any chance it was a raccoon? There is a condition called coonhound paralysis. It is triggered by the saliva of raccoons and causes a progressive paralysis of all our limbs. That sounds like what you are seeing. The paralysis can last for months and they have to be cared for during that time depending on the severity of their symptoms. Most dogs do eventually recover. Did he see a veterinarian? Did they mention coonhound paralysis?
Coonhound paralysis is not an infection so it will not improve on antibiotics. Symptoms usually start 7-14 days after exposure to a raccoon. There is no treatment for it. However, because the dogs don't walk they are prone to bladder infections and pneumonia. They need a lot of nursing care so that they don't develop sores until their mobility starts to return. The difficult thing is that there is no test for this condition, it is something that we diagnose because the symptoms fit and we can't find another underlying cause.
Here is a good article: http://www.petmd.com/dog/conditions/neurological/c_dg_coonhound_paralysis