I'll bite anyway...
There isn't a hard cap for Dodge or Parry because reaching the point that dodge or parrying rating give you absolutely nothing is completely impossible. But that's not to say there isn't an avoidance cap. The CTC (Combat Table Coverage) is 102.4%. If you can reach 102.4% between dodge, parry, block, and miss (Dodge % + Parry % + Block % + 4.4% Miss), you will avoid/mitigate every physical attack that comes your way.
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