This is a photograph of a spinal cord. This ought to be a spinal cord out of a dog. If it were, you should be able to tell me what breed of dog. But, in fact, it is the spinal cord of a calf. It could be a sheep or a man. It might be a cat. If it were a cat, the odds are it would be a particular kind of cat. What kind of a cat?
There either is expansion of the central canal or multiple cavitations of the cord.
It is an example of spinal dysraphism. Can be hereditary in dog and cat.