The plot of 'The Last Dog' by Katherine Paterson is quite interesting. It's set in a world where everything seems to be in a state of decay and control. Brock, the main character, is living in a society that has a very specific view of the world. Then he stumbles upon a dog, which is an incredible find as dogs are thought to no longer exist. This discovery makes Brock start to think differently about his world. He begins to understand that the stories he has been told might not be entirely accurate. He forms a bond with the dog and has to navigate the complex web of his community's rules and his own new - found feelings towards this creature from the past. As he does this, he also starts to see the potential for a different kind of future, one that includes the beauty and wonder that the dog represents.
The main character in 'The Last Dog' by Katherine Paterson is Brock. Brock is a young boy who has grown up in a world with very strict rules and a certain way of thinking. He is the one who makes the discovery of the dog. The dog, though not given a specific name in your description, is also a main character. It represents a connection to a different time, a time before the world became the way it is in the story. Brock's interactions with the dog, his attempts to hide it and then deal with the situation as it unfolds, are what make the two of them the main characters in this story.