Companion Animals

Hepatic Encephalopathy in Dogs: Welfare and Management

Managing the neurological complications of liver disease in dogs and supporting quality of life.

Key Facts

Hepatic encephalopathy (HE) occurs when the liver fails to clear neurotoxins, particularly ammonia
Signs include disorientation, head pressing, seizures, behavioural changes, and coma
It is most common in dogs with portosystemic shunts or severe inflammatory liver disease
Episodes are often triggered by high-protein meals, gastrointestinal bleeding, or constipation
Management involves dietary protein modification, lactulose, and antibiotics to reduce ammonia production

Welfare Considerations

Hepatic encephalopathy causes profound acute welfare impairment during episodes. Affected dogs appear profoundly confused — they may walk into walls, stare blankly, circle, vocalise apparently without cause, and fail to recognise their owners. Seizures cause fear and physical risk. The post-ictal period following seizures involves further disorientation and distress.

Between episodes, dogs with chronic liver disease may have reduced quality of life from general malaise, nausea, and the restrictions imposed by management. Dietary protein restriction, while necessary, conflicts with normal canine feeding behaviour and may cause frustration.

Acute HE episodes require emergency supportive care — fluids, lactulose enemas to reduce ammonia absorption, and anticonvulsants. Dogs with portosystemic shunts may benefit from surgical correction, which can significantly improve long-term quality of life by restoring normal hepatic circulation.

What You Can Do

Seek emergency veterinary care if your dog shows signs of neurological episodes or seizures
Feed a liver disease diet with controlled, high-quality protein as directed by your vet
Administer lactulose as prescribed to reduce ammonia production and absorption
Avoid high-protein treats, table scraps, and foods that may trigger HE episodes
Discuss portosystemic shunt surgery with a specialist if appropriate for your dog