I'm so glad Jazz is happy and living with other Greys.... You have a nice family of pups there! Since Jazz is from the same litter you should know that both Bullet and Blast suddenly lost use of their back legs. Blast dropped 3 days before xmas but was able to stand within 12hrs, recovered fully with in 3 weeks with high doses of steroids, and as you have read Bullet didn't. I think ruptured discs are running in our family. Other than that they were/are healthy. Bullet was the alpha, usually pretty laid back and lazy. Blast is the total opposite, hes fully of energy and kinda hyper. Bullet would walk right next to you on the leash while blast is trying to rip your arm off. Totally opposite personalities that were best buddies.