Not sure where your located exactly but Yelm can be a lot of area. Lol, ya know that. Bald hills, Harts lake, JBLM etc. I reckon you closer to Harts lake/bald hills area which is actually same area just separated by the river and Wilcox! Also frequent elk there. There has always been issues around these parts of wild/domestic packs of dogs raising heck and also of Wolf/hybrid breeders which come n go. Long history of this stuff. I reckon that is what ya dealing with. Probably not killing cattle but pets n garbage for sure. Dangerous none the less. No doubt some hybrids are running around with dogs somewhere. Probably spend the daytime hours on their owners porch too.