Game Mechanics: Pets should have an innate proc rate bonus with weapons until November 2000

[Dolalin]

Well:

We recently changed this so that they now proc effects with just about the same frequency as player characters with the same dexterity.

And:

A pet with maxed out dexterity will proc nearly as much as it used to.

...would indicate that the pets were not proccing much more than a player with capped Dex would.

It should be tied to the proc rate for PCs, whatever that happens to be. If you think it's too low, you should find evidence of that.