I have not found anything that stops them from eating it except what the other replies have been, to pick it up right away. I am a lot like Melody as I am out with my dogs morning, noon and night picking up the poop as fast as I can keep up with them. It does cause other problems as the dogs will get ecoli (sp?) from eating it. Maybe that is why your girl is vomiting now.
In addition to the advice of others re: picking it up asap, I also suggest that you begin to give her acidophilus capsules, (either open up the capsule and spread the powder on her food or poke the capsule down her throat). This helps with keeping the intestinal flora, to compenstate for the "bad" bacteria she ingests by eating any poop that you are not able to get to, before she does.
