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Hello. Thanks for writing in. This is definitely something odd and leads me to believe that it may be associated with the spinal cord. There is a lesion that is called a dermoid sinus that can cause a communication before the skin and spinal cord. It is usually something they are born with, but it may not have been noticeable until it opened up. It is most common in Ridgebacks, but you can see it in any breed. If the difficulty walking is more because he is trying to scratch when you touch it, it can still just be related to an allergy or skin infection. If it is more neurologic, I would be concerned about a dermoid sinus. If the lesion is closer to the neck area, syringomyelia is possible. This is more of cyst that forms around the spinal cord. It won't directly cause the skin lesion, but it can form from excessive scratching. This is rare in dogs. It is seen most commonly in Cavalier King Charles Spaniels, but it can be seen in other breeds as well. I would have your vet check this out soon. If related to the spinal cord, it can get worse. Please let me know if you have any other questions or concerns before rating. Hope this helps.
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