Crothian said:
Well, according to pg 21 in the DMG Dodge bonuses do stack, so I don't really see why they would not stack here.
If the feat grants a new bonus, then yes, they stack. But if the feat just takes the existing bonus and loosens its restriction, then it's only one bonus and there's nothing to stack it with.
Maybe I need to explain myself in a different way.
Say we've got this dwarf. He carries around a coupon that says "Good for +4 dodge bonus. Applies to creatures of the giant type." Every dwarf is issued his coupon at birth, and it's impossible to lose. In combat, whenever a giant attacks the holder of such a coupon, its power takes effect and grants the +4 bonus.
Now imagine a dwarf who takes Titan Fighting. There are two possible interpretations of that feat.
One interpretation says that the dwarf is issued an entirely new coupon. Its text says, "Good for +4 dodge bonus. Applies to any larger creature whom bearer is Dodging." Since it's a separate coupon, it grants a separate dodge bonus, so it can stack with the original. I do not think this is correct.
IMO, the feat just changes the text on the coupon the dwarf already owns. Its restriction line is altered to say, "Applies to creatures of the giant type, AND to any larger creature whom bearer is Dodging." The dwarf can now use the coupon in many more situations, but it's still only one coupon, so it only grants one bonus and cannot stack with itself.
Am I making sense yet?