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Hi this is Dr. Hill. If Zoey is not able to move her back legs then she either has a ruptured intervertebral disk in her mid back or she has a blood clot to her spinal cord (fibrocartilagenous emboli). A ruptured disk is surgically treated to decompress the spinal cord and allow it to swell and then hopefully return to normal and regain use of the limbs. If it is the emboli, then it is time and supportive care. These are not surgical, but many improve with time. You need to make sure that you ask your veterinarian for a referral to a veterinary neurologist in order to find out which it is. You also need to make sure that you are able to express her bladder. If she cannot use her back legs, then it is very likely that she cannot urinate. She will need to have her bladder expressed at least three times each day. Your local veterinarian should be able to show you how if they have not already. Please ask any additional questions.
there is tick paralysis, but usually a tick is found and the paralysis starts to resolve over several days once the tick is removed. Did your vet say if Zoey still has "deep pain"? this means sensation when the bone is pinched.