FeedMachine is a hunter addon that creates a button that appears when your pet needs food, which is linked to what food you actually have. It's a rebuild of an old addon named King of the Jungle which hasn't worked properly in.. a long time.
Configuring what you feed your pet is done fromt he ui, which can be accessed from the blizzard interface.
FeedMachine: v1.16 Toc fix because I apparently fail at 0s, no actual changes.
FeedMachine: v1.15 Since Blizzard poofed happiness, changed to show button when pet is <50% hp and out of combat
FeedMachine: v1.06 Finally got around to fixing the option window opening behind the Blizzard windows (Blizzard windows now close)
FeedMachine: v1.05a Fix for PT changes, update libs to pull cata foods, add submitted DE translation.
FeedMachine: v1.01 Knew I forgot something.
FeedMachine: v1.0 Went over it more closely, it really 'should' work now.
FeedMachine: v.1 Alpha for 4.0.1 I 'think' it should work, it didn't error on me manipulating the menus, haven't used it really since Bloodthirsty was added.