This is new to me? I grew up with ropers up the street from me and worked a cutting horse ranch for a few years when I was "between" jobs but, I've never heard of using e-collars for horse training.
I guess you learn something new everyday?
http://seattle.craigslist.org/see/grd/2116083657.html
I guess you learn something new everyday?
http://seattle.craigslist.org/see/grd/2116083657.html