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I have just lost my miniature jack Russell. He was only three years old . I noticed he seemed off and took him to the vet who said his back leg was swollen and gave pain relief. A day later he couldn't move his back legs at all. The vet referred me straight to s specialist who did MRI scan and said he had a disc prolapse in his spine but was hopeful immediate surgery would improve him. Within an hour the vet said it was far worse he had two ruptured discs an would never walk again I was advised to have him put to sleep. He was an active adorable strong little dog. Up until that day he ran around and played with my Pointer without any problems. My worry is the vet said these dogs have short legs and are predisposed to spine problems and it could be a minor movement that would cause it. I have to eventually have another dog for my Pointer I would not want this to happen again. I would not have hesitated to have another mini jack but am worried about the breeds if this is the case