Here's a short entry, a feat to which I've previously alluded.
You have a pet that is particularly loyal to you and that possesses abilities beyond those of a normal animal. Think of the monkey Jack from Pirates of the Caribbean, the parrot Captain Flint from Treasure Island and the dog Dundee from Robinson Crusoe for examples of such extraordinary creatures.
Prerequisites: Dog's Best Friend, Monkey Magnet or Parrot Perch fortune.
Benefit: Your selected pet gains two bonus hit dice, a +1 bonus to two ability scores and one bonus trick.
Normal: Your selected pet has no unusual abilities.
Special: You may select this feat multiple times; its benefits stack for that pet.