Dog Health Questions? Ask a Dog Vet for Answers ASAP
Welcome to Just Answer. I'm very sorry to hear about this guy's paralysis of his rear legs. In all honesty, the most common cause of rear leg paralysis is a spinal cord compression. This occurs due to a disc that is compressing the spinal cord. At this time, this is very serious and needs to be evaluated by a veterinarian. I would get him into an ER clinic now to have him diagnosed and treatment options given. Here is a good link on this type of injury.