The liver is a real powerhouse within the body and is responsible for breaking down and detoxifying harmful agents and activating other substances essential for metabolism. It also stores nutrients and is important for immunity.
The Milk Thistle fruit contains the well documented active ingredient silymarin which supports the liver in several ways, most importantly by scavenging /destroying free radicals that are associated with cell damage and transforming them into less harmful compounds. 
 
Suggested use: 
Small Dogs (10-18kg) up to 5g  a day. Divided into two meals
Medium/Large Dogs (19-40kg) up to 10g a day Divided into two meals