Critters that kill just to kill

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Over the week end my wife's two pet alpaca's were killed by what I now think was a pack of feral dog's. In two years here at the ranch nothing has bothered them, Not coyote's, not the lions ... Nothing. over the week end I found them both dead at the bottom of the south pasture. I've been riding and looking ever since but the grazing allotment here is 40,000 Acres so there's a lot of ground to cover ... If I find them they are Dead Meat.
It's a shame that two docile and gentle critters like Royal and Zen had to die that way just for the sake of being killed.
My Wife is very, VERY upset.
Vengeance is MINE sayeth the Rancher.