DHA is an omega-3 fatty acid that is conditionally essential, meaning the body’s DHA formation alone does not meet the DHA requirement. Thus, it should be adequately supplied in the diet. It is important for the development of the nervous system, vision, and immune system in puppies. It is considered an anti-inflammatory fatty acid and is used in the treatment of multiple inflammatory diseases. It also has an important role in mental function, and aggressive dogs have been found to have lower DHA concentrations.