Hello its sunday and vet not opened. I have a 4 year old japenese harliquin. Weighs 9 lbs ans sees the vet twice a year. Healthy. He did a dead buny roll, and did a 1 and half roll. 10 minutes he crawled to his closet. Not using back legs. Trying to get comfortable. Did he sprain something OR coyld he be suddenly dying . he is not screaming. Please help!! Doreena and jack.