Welcome to Boomtown

Sid and Freya meet, insult each other, fight each other and then kiss each other in the post apocalyptic world. They move to Boomtown with Scrapps, a human pretending to be a dog and pet of Freya. That part I don't understand. They live together in a shack of a home and try to build a normal stable life. Sid gets a job working for a junkman played by the ever awesome Steve Buscemi. The show has its moments, Daniel Radcliffe does a stellar job in playing Sid. He is quite a great comedic actor. The actress who plays Freya does a believable job as a warlord going normal. The boomtown isn't really desirable. I just wished to understand why Scrapps played the dog.