Symptoms can progress extremely rapidly in a matter of hours and occasionally even minutes. The back may be arched. This can progress to paralysis. One leg may be more severely affected than the other. Digital pressure at the level of the disc extrusion usually elicits pain.
Animals usually have fecal and urinary incontinence if they are unable to stand and walk.
The clinical signs reflect varying degrees of involvement of the hind legs, urinary bladder, anal sphincter, and tail. Pain may be the only symptom present. Affected dogs usually have decreased activity and are reluctant to jump. Many have difficulty rising and some have difficulty posturing to defecate. Pain is often present over the lumbosacral area when digitally palpated or when the hind legs are extended.