Simple bug, if you give shaman pets weapons they don't equip them like other pets do. They continue to "bite."
Carrying rusty daggers (or whatever) around was a pretty essential part of playing a shaman back in the day, since this was the only way to ever make the shaman pets dual wield.
It also doesn't allow you to utilize proccing weapons, of course.
Edit: Here's a thread where people "discovered" that giving pets weapons allowed them to dual wield / proc:
http://samanna.net/CRUCIBLE_SAVES/pets_and_weapons.html
Of course, this mechanic existed long before that thread was created and some shaman knew of it, but things weren't talked about frequently in the open due to fear of nerfs.
Edit2: Also here:
http://samanna.net/sham.info/tips.shtml
Scroll down to "Dog Dog."
Quote:
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General wisdom is that pets will dual wield if given two one-handed weapons, so give them the cheapest ones - or ones that will can proc at that level.
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