You shouldn't keep an animal that doesn't' belong to you.
Rachael picks up a dog walking down the street, and notices the contact information of the dog's owner written on her collar.
Rachael wants to be close to the dog.
Rachael returns the dog to its owners asking if she could foster him when they're not around.
Rachael tosses the collar in the trashcan adopting the dog.
Rachael ends up getting paid as the family's official dog sitter.
Rachael gets in trouble with the owners who spot her walking the dog a week later.