THEIR ARE SEVERAL WAYS, THE DOGS YOU TALKED ABOUT WONT REALLY WORK THAT WELL BEING SHEEP TEND TO BUNCH UP MORE AND CATTLE SPREAD OUT MORE. POISIONING SEEMS YOUR BEST BET, USE STRYCNINE OR ANTIFREEZE, IF YOU USE STRYCNINE PUT THE PILLS IN SOME KIND OF GREASE OR LARD. THERE IS ANOTHER POISON YOU...