Lots of well meant, but misinformation offered in this thread.
1. they are coyotes, not coydogs. Dogs and coyotes CAN breed, but it's done as a survival mechanism for lack of a better term. For instance Coyotes aren't in such and a such a place and the population slowely builds and expands in a direction well there might be an ambitious yote or two that range further- no mates tp breed,. they will, to further thier gene pool and establish a population, mate with dogs- that's one of the main reason you see color variations in yotes. It's RARE and under special circumstances. If you look at the coydog link someone provided several things stand out- 1. it's a taxidermy speciman and 2. the narrative underneath talks about if you have on as a pet you need to... blah, blah, blah kinda like if you bought a wolf hybrid- some knucklehead (well intentioned if your one of them I'm sure) breeds them like the wolf hybrids you can buy if you call it a mixed breed and wink. 3. There may very well be 5 yotes in a group- this would be a family group and broken up by now or breaking up to go thier own ways, but in any event- there not exponetially more "dangerous" than 1 or two. Imagine if your neighbor, his wife and 4 young kids "attacked" you and your family (just go with it- at least it's a true though wierd example of what's going on) You'd be very worried about the man- bigger, meaner, etc, pretty worried about the mom- though smaller protecting her kids, and less worried about the inexperienced, less sure of themselves kids- same with this group of yotes. 4. They haven't been THAT brazen- nothings been killed wounded or attacked, attempted yes, but chased away. The dogs haven't been attacked, nor has anyone else. There response to the threat was to turn and run. While attacks on people have been documented they are uncommon and not the norm. Caution, not fear is called for. 5. No "state agency" released any wolves. There's a version of this about yotes, wolves, etc from state to state to state. Just irrisponsible to further this claim. 6. May or may not be a wolf running around Mass. if it is it's probably an escapee from somone that owned it illegally or legally but hasn't reported it. It's survival skills, instincts,etc will probably be much less than a raised in the wild wolf and it's not one of the pack or a whole pack of wolves that's bothering your animals.
We'll now what should you do. Probably what several people mentioned- electrify your fence, dig your fence down under the ground, cover the top for extra security- lock the animals up at night. Myabe get some hound hunters in there or trappers. I like hound hunters for two reasons. One I hunt coyotes with hounds, but two and more importantly, I really think hounds do more to educate a yote as to trouble in an area than any trapper ever does. If your chased for hours at a time week after week, eventually you'll find a more inviting place to frequent. Altough you need to eliminate over 75% of a yote population before a decline is noted, your just looking to take the yotes that have taken an interest in your stock and persuade them to find an easier meal. Take precautions, and be cautious, but not fearfull. Coyotes won't get at someone's stock because a certain yote or small group of yotes are especially dangerous and brazen. they will get at your stock because they are oppertunistic and took advantage of an oppertunity we give them. Their brazenness comes from the realization that an oppertunity to get a meal exists. They don't survive as well as they do by being brazen and confrontational. Good luck, Keystonepaul