The druid's animal companion says, "An animal companion gains additional... feats for bonus HD as normal for advancing a monster’s Hit Dice."
Can an animal companion take feats from any category and source?
Role-playing Games Stack Exchange is a question and answer site for gamemasters and players of tabletop, paper-and-pencil role-playing games. It only takes a minute to sign up.
Sign up to join this communityThe druid's animal companion says, "An animal companion gains additional... feats for bonus HD as normal for advancing a monster’s Hit Dice."
Can an animal companion take feats from any category and source?
You can take any feat that the animal companion qualifies for.
No, really, you can. A list, suggestions, and etc. could be very long. Mooncrow's Handle Animal Guide is a good handbook to give a good read to help you in deciding. Not only does it cover feats, but it also covers skills, equipment, templates, and so on.