What is significant about how the animals arrange themselves as they gather to hear Major?What might this arrangement say about future meetings or events?

It signifies that animals will take charge.

Explanation:

Here, the pigs and dogs sit in the front row. The other animals arrange themselves behind the pigs and dogs. In the future the pigs will be in charge, and the dogs will guard the pigs. Also ,Man is the only animal who produces nothing, but consumes what animals produce.

tbh idk same thing here