Most of the guides and discussions that are easier to find for animal companion builds are either older and don't incorporate Ultimate Wilderness options, or they're focused more around damage output. My hope here is to get some discussion going for more ideas.
The idea is more along the lines of utility options and tactics for a companion rather than outright damage from the companion. Things like battlefield control/disruption, buffs or debuffs.
-Menacing enchantment on an Amulet of Mighty Fists: provides an additional +2 bonus to allies if a creature is flanked
-Disruptive Companion feat: A mini version of the Disruptive feat, plus makes it harder to Take 10, even with abilities that allow for it.
-Broken Wing/Wounded Paw Gambit teamwork feats: Creates attacks of opportunity
-Skirmisher tricks: For hunters or skirmisher rangers. A lot of options here.
-Vine Strike spell: Not PFS legal, but otherwise an option. Potential for the entangled condition.
While there are Combat Maneuver options, I'm looking outside of them as I've found they tend to lose steam for a companion after the early levels. The lower BAB progression doesn't seem keep up well with the increased HD/BAB and Strength progression of creatures.