1.A 5-vear-old male neutered miniature Poodle presented with an acute onset paraplegia. This happened yesterday while he was chasing a ball and ran onto the wall. Physical exam was unremarkable. Neurological exam revealed:
 - Normal mentation
- Paraplegia
- Postural reaction tests: normal in thoracic limbs, absent in pelvic limbs
 -Normal spinal reflexes in all limbs
-Cutaneous trunci reflex: cut-off at L2 vertebral level
-Markedly increased muscle tone in the thoracic limbs
-Pain perception present in all limbs
-Mild discomfort when palpating the thoraco-lumbar junction
-Normal cranial nerve exam
 Differentiai diagnoses include (a) degenerative disc extrusion/protrusion and (b) acute non-compressive nucieus pulposus extrusion.