I am currently working on a dex focused hunter but some of the stuff is universal useable by any melee hunter.
1. Feat: Spirit’s Gift
This can be picked at 1st level. Each day you can give you animal companion DR 5/adamantin (stone spirit) or fast healing 1 (life spirit) for 24h. Makes any animal companion any animal companion nearly unkillable for early levels.
2. Teamwork feats: Outflank, Precise Strike, Pack Flanking, (Tandem Trip)
With this setup you get +4 to hit and 1d6 damage anytime you and you animal flank an opponent. Thanks to Pack Flanking you flank most of the time you and your animal attack the same opponent. In the case of wolf as animal companion i surgest to add Tandem Trip. So you wolf can roll twice on most trip attemts.