"I'm a good dog..."

Chase is a Good Dog. She's a good dog almost to the point of self-destructiveness - a beaten dog who doesn't understand why her master doesn't love her anymore, after she's been nothing but Good And Loyal her entire life, but she'll fawn and appease and beg for affection because they're all she's ever known and she loves them despite the cruelty. She's as ill-suited to being a Helldiver as a lurcher is to being a wolf-hunter but that's the job her master gave her and that's the job she's going to faithfully do until it kills her.

And why a lurcher? Lurchers are known for their intelligence, ability to blend in, and obedience. They are very smart, highly trainable, and all-around Good Dogs.

...

They're also known as poacher's dogs - and what is Super Earth if not a poacher on a galactic scale.