This was addressed in an official patch message on November 29th, 2000:
Quote:
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November 29, 2000 3:00 am
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*Patch Day*
...
- Random-effects on weapons carried by pets will now behave as if the
pet is a player character rather than an NPC. The change last patch
reduced them to a rate below player characters. As part of this patch,
target-specific random effects will only work if the target is the
intended type. For instance, a weapon that processes "Dismiss Summoned"
will only "go off" on a summoned NPC instead of everything.
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http://everquest.allakhazam.com/hist...es-2000-2.html
This also suggests all NPCs had a hardcoded proc rate above that of PCs.