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Does a dwarf vs a tripping giant get +8 to his cmd against the manuver?
They get +4 dodge AC against giants: Defensive +4 CMD vs trips: Stability
By RAW I see nothing to the contrary. Dodge bonuses add to your CMD, and they get a separate bonus against tripping that are of stacking types. It makes sense as dwarves are basically designed to fight Giants.
If you have Imp trip as a dwarf, there is an extra +2 to be had as well.