Hi mate.
Thanks for showing such interest in my game. I'm flattered and honoured that you took the time to play it multiple times. In regard to your queries:
1. As I was writing, the friends weren't supposed to all be the same person, but they are related by proximity, as you're all supposed to be familiar with each other, it makes sense that the friends are all in or around the same neighbourhood or village
2. The intention was for it the rest of the table to portray The End, in turn, for each dog. If you found this cumbersome, perhaps try instead of doing each players' days as a whole at once, split the play into smaller chunks of time for each day, so that no one player has the floor for too long.
3. To be honest, the Dog Creation is first in the document as that is the norm for Role Playing books in my experience. If your party saw more sense in decided on the Ending first, then by all means go that way. There's no wrong way to enjoy this game, it's supposed to be malleable to your party's styles, so that you may lean on each other to weave memorable stories.