Portosystemic shunts cause hepatic encephalopathy and failure to thrive in affected dogs, with surgical correction offering significant welfare improvement when performed at specialized centers.
PSS welfare encompasses two distinct problems: the quality of life on medical management, and the welfare implications of surgical intervention. Dogs on medical management experience controlled but not eliminated encephalopathy - episodes of neurological signs from protein metabolism toxins that represent acute welfare events, alongside chronic restriction to low-protein diets that may limit appetite satisfaction. Surgical correction, when successful, allows return to normal diet and eliminates encephalopathy episodes, representing significant welfare improvement. The welfare decision around surgery requires honest assessment of risk versus benefit at specialist centers with appropriate experience.