3201. An 8-year-old Shih Tzu screams on standing up and shivers for the past 7 evenings.Why?

July 11, 2018

7 evenings of screaming on standing up followed by shivering body for some time. Why?
"Does it happen in the morning?" I asked the owner who said no.

Palpation of lumbar spinal area showed slight pain with a hunched back (video). Nothing serious like slipped disc. X-rays