I will let you know how it goes. Cooper doesn't attack, but he does seem to feel that he's the protector! Any little sound or movement just sets him off and then he'll give a low growl for 5 minutes or more. That may be normal at times but I don't think it is every minute of every day. I'm hopeful that after a month of this he can block out those things and just focus on being a dog!
btw, my cost was $40 for a 2 month supply.