Now I'm quite certain I was right to avoid watching last night's episode. The last thing I needed to see/hear about was a small dog being attacked by an aggressive neighbor dog. And I'm sorry for Chelsea and Aubrey, but I'm far sorrier for the dog. I've had dogs get away from me too, but it sounds as if she really wasn't taking proper precautions. I hope she at least learns something from this horrible incident, but she's not shown that she's particularly good at learning anything.
Unfortunately, of course, whether she learns anything or not, there's always going to be a pet shop or backyard breeder that won't care what kind of pet owner she'd be, as long as she has cash in her pocket, and until her father wises up, that's never going to be a real problem for Chelsea.