Crossed Extensor Reflex
Recumbent pets with lesions of the UMN pathways may have a crossed extensor reflex when the withdrawal-flexor reflex is evaluated. Reflex extension may occur in the opposite limb to that being tested. Although typically abnormal and indicative of UMN disease, normal dogs occasionally have crossed extensor reflexes. To avoid voluntary extension of the contralateral limb as a response to the noxious stimulus, the withdrawal-flexor reflex should be elicited with a mild pinch while the opposite limb is observed.