Yeah of course, you just rent the dog, and when you're 'done' with it, you just slide it through the little return slot at the dog rental place.
You can... rent dogs!?
In all seriousness though, you'd be surprised what you can rent if you look hard enough. Used to know someone who would rent out a really fancy apartment that looked lived in for people to bring friends/dates home to to make it look like they have good taste in their every day lives.
Making a new home by taking fake personality? That's the worst thing i can think of. Yet many people do this. I just don't get it.
Anyhoo, I was living in a foreign country for a year and I knew absolutely no one when I moved there. After 4-5 months of solitude (luckily I'm fine with solitude as long as I can do stuff), I went out to a bar and meet a girl, then her friends. This was quite an achievement because I'm shy and awkward. But at least I didn't talk too much. So there were a few people I could call friends.
I also had a flatmate after 6 months, but he wasn't too social outside of school, so I wasn1t introduced the local life by him.
So no advice here apart from: Don't take fake personalities just to make some friends. (But I guess in America it's the normal)