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Without going into too many spoilers, Narrow Frame wouldn't be useful to you until 7th level, when the Tyrannosaurus goes from Medium to Large sized. That would either be very late Book 2, or early Book 3. Either way, there are spots in the remainder where it would be difficult to take a Large animal through, but not as many as you might expect.
In general, you might be able to get away with it, as long as you're OK with the dinosaur squeezing through some spots.

Atalius |

Also, for what it's worth your animal companion needs to take the feat, not you.
What feats are you planning for your companion that you can't fit it in?
I could understand not having room on your character, but your character doesn't need it.
I plan on taking vital strike, toughness, improved share spells, improved vital strike, outflank, power attack, cleave, ferocious focus, improved natural attack and a couple other desirable ones. But as you can see I can't even have all the ones listed, there are just too many.