Poor Roscoe, he never had a chance with you did he? Why should we sympathise with a person who does't listen and who doesn't take the advice given? You were given wonderful advice numerous times and chose to disregard it and look who suffered - ROSCOE! Not You, you gave him what 20 minutes of your precious time and decided that was it, this is just all too hard i'll just kill him instead.
You said that next time you would reseach more - I have a better suggestion, why dont you spend the money and take the dog to obedience school or better still, save your money and buy a stuffed animal, you dont have to do anything with them.
Roscoe, may you fly high with the angels sweet boy.