Where do the dogs come from and how do they act around napoleon?

The dogs in George Orwell's "Animal Farm" are raised by Napoleon as a means of asserting his authority and maintaining control over the other animals. They are trained to be fiercely loyal to him, serving as his enforcers and protecting his interests. Around Napoleon, the dogs display aggression and obedience, intimidating any dissenters and reinforcing his tyrannical rule. Their presence symbolizes the use of violence and fear to suppress opposition in a totalitarian regime.