Puppy throwing up, vomit smells like poop. Should I be concerned?

As a veterinarian, I become very worried when I hear about vomit that smells like feces. It could be something as silly as Koa ate some poop, and now she's vomiting it up because eating poop is gross. However, it could also something much more serious. Vomit can smell fetid when there is an intestinal blockage, like she ate a sock or corn cob, etc, or if her intestines are bunch up and this is causing and obstruction (this is called an "intussusception" and can happen in puppies.) If she vomits once, and is otherwise doing well-- eating, drinking, playing, etc, then it may be the former scenario. However, if she looks like she feels crummy, she continues to vomit, she's not eating, etc etc etc, I would take her to a vet as soon as you can. Intestinal obstructions are very serious and require emergency surgery. Best of luck to you!