Omen Rider Feat Selection for Mount

[CGNefarious]

So I'm playing in an Omen Rider Harbinger//Dervish Defender Warder in a "We be Goblins" game on Friday. I've never done mounted combat before and I'm having difficulty trying to choose a feat for my worg mount. It has a 6 Intelligence, so it can take practically any feat. Any suggestions on what I should take?

[Extra Anchovies]

I like +numbers feats for mounts. Improved Initiative, Toughness, Open Minded, even the +2 save feats can be useful. Lunge is also a good one, and if you have a feat to spare Shake it Off could be useful for both you and your mount to take (because when you're mounted it'll be a flat +1 to saves).