In pets with heartworm infections, the kidneys and liver work harder than normal to help the body respond to constant parasite abuse. (1800petmeds.com)
I'm my experience, liver works best with smoothies that are a little more robust — like one with an acai base or one that uses peanut butter. (megangarcia.com)
Meats such as beef tongue, heart and liver work very well. (vetbabble.com)