In my location, central Missouri, coyotes likely with little or no wolf in background so are standard the standard 35 to 40 lb size. Red fox and red-tailed hawk are handily more important as daytime predators. These smaller guys are real issue when flock must be dispersed enough for nutritional benefits of free-range production are to be realized. Having more birds on smaller tracts can otherwise approximate run or feedlot where landscape is denuded.
Larger dog would do same although cost would be higher and not justified unless flock is very large. I do not know at this time what is very large for a flock, do you?
Edited by centrarchid - 3/26/12 at 2:36am