Folks my heads done in here,I want to buy a shock collar for breaking the dogs to sheep.Was set on a canicom1500 then done a bit of research.Dogtra,Innotek,Tri-tronic,Canicom,Sportdog ETC.I said I just want it for stock breaking but I would still like to buy the best in case at some point I want to use it for something else. Advice would be greatly appreciated preferably from trainers or people who have used a range of different ones.