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Hello I am Dr RB and I am a small animal veterinarian. I am so sorry that Holly is having trouble. Progressive weakness in the hind limbs have several rule out diagnoses so it is impossible without other diagnostics to be certain if tick paralysis is the cause. However, if you found the ticks on her and the location is consistent with the limbs that are affected, it is very likely. Tick paralysis affects the peripheral nerves primarily so you would see progressive weakness and/or partial paralysis in the affected limbs. However, another disease process that would present very similarly to this would be intervertebral disc disease involving degeneration or traumatic propulsion of disc material into the spinal column causing impingement and inflammation of the spinal cord. This would affect motor and sensory function at the spinal cord level and secondarily the affected limbs depending on the location in the spinal cord that was affected. Determination of a herniated disc would require imaging such as spinal x-rays, MRI or CT. Return to motor function would require veterinary intervention either through medication to reduce inflammation in the cord and/or surgery to remove the disc material.
A couple of test you can perform on Holly are this... Put her on a tabletop and while supporting her underneath, place her back paws upside down so that the top of the foot in on the surface of the table. Does she automatically flip it right side up or is this delayed or absent? Also pinch the skin in between her toes and observe her for a reaction such as looking at her foot or you and trying to pull her leg away from you. If she passes both of these tests, then tick paralysis would be more likely given that only peripheral nerves are affected and her proprioceptive and/or sensory function isn't compromised. However, if she doesn't respond well to these tests, I would be more concerned about a disc herniation affected her at the level of the spinal column. To be safe and give you peace of mind, it may be easiest for you to schedule a visit with your regular veterinarian to help you sort all of this out. Let me know if I can be of any more help to you?