"Sure, whatever. I don't really care about your poodle or how it got to be a zombie. Just care that if you adopt a dog, you'll take care of it. And you should look into adopting one. There are over two dozen to pick from. I'm sure you'll find one to get along with." It wasn't hard to take care of a dog. Anyone with a decent attention span and the capacity to care about something other than themselves could take care of a dog.
From the sound of it, Marceline came from one fucked up world. Surviving for Bex meant drinking blood, occasionally killing large numbers of people, and fleeing the city she'd chosen to take up residence in because of her father. It was possible that Marceline really did turn her food sources into mummified corpses, but it was also possible that she just didn't have control or something. Regardless, if she wanted blood, she could just go get it from the hospital.
"It's not all bullshit. Well, not for any vampires I or my brothers sire. We are much harder to kill, and we have the benefit of a thousand years to control our abilities." Bex drained her glass as well. "If you want blood without the mummified corpse, check out the hospital. They've got a blood bank there that the docs will give you if you ask for it. All the delicious blood without the nasty side effects. Can't imagine just the color red being as enjoyable as blood." She wasn't about to suggest sucking on the locals if it meant leaving dead bodies around. Killing food was in poor taste, unless it was because she was eating while killing.