Chicken gizzards are the organs, ususally heart, liver and kidney. I usually boil them for broth or gravey when I make fowl for us humans. I don't feed my dog raw so I can't help you with the other questions you have.
If you're green, you're growing...if you're ripe, you're rotting!
I try to greet the world like my pets do...boundless enthusiasm, intense curiosity and no concept of yesterday and tomorrow.