A sheepdog is there to protect the whole herd from wolves. His JOB is to keep them safe.
Do y'all even know what a real sheepdog does? Have any of you actually worked with a sheepdog or been with a shepherd, the flock, and a sheepdog(s) and watched them work? Okay, I will admit that my experience is limited to spending the afternoon with a shepherd in Constance Germany as he had his dogs working his flock across the campus of the university there. He had been hired by the university to shepherd his flock onto the grounds to keep the grass manicured. He explained to me how he controls the dogs, their pecking order, their personalities, etc. He was quite proud of his dogs in the control and protection of his flock and the dogs that he had were those that had survived training. Bad sheepdogs get put down early on.
You are fairly naive to believe that sheepdogs are there to magnanimously serve to protect sheep at all cost to their own lives. If you wish to equate yourself with actual sheepdogs (of which their are a variety of breeds), then understand that they are not this romantic version being spewed here any more than men in general are quintessential chivalrous good samaritans.
First and foremost, a sheepdog works at the beck and call of a master who commands the sheepdog regularly, both rewarding and punishing the dog as needed. Proclaiming you are a sheepdog is to proclaim that somebody else is telling you what to do everyday, day in and day out. The sheepdog lives to serve the master, not to protect the flock. Who is your master?
While a sheepdog serves to protect the sheep, that is just one aspect, the myth today of a Warner Brothers cartoon. Their job isn't so much about protection, but about control of the flock. They are there to dominate the flock in to behaving or moving in manners deemed by the master. The master is there to exploit the flock as s/he isn't magnanimous either. The sheepdog is there to make sure the master gets what he wants from the flock. So the sheepdogs see to it that the master can do whatever he wants to the sheep, be it shearing them or killing them.
How does the sheepdog tend to the master's needs with the flock? Is the sheepdog a nice guy who politely asks the flock to comply with the master's wishes. No. The sheepdog is the henchman that bullies the flock into compliance through intimidation and pain.
The sheepdog is also known for a nasty side, poaching the flock himself. If caught, the dog may be punished by the master or killed, especially if it is a repeated event. You see, sheepdogs as a group, are not entirely trustworthy. It is no wonder the sheep fear them, bullies by day, and potentially killers by night.
The story recounted in Killology about the role of the sheepdog is nothing but a fairy tale work of fiction. If you want to be a sheepdog, talk to your fairy godmother.