Thank you for looking at this post, since it's such a horrible subject. Daisy, our latest, has worms. We took her to the vet and have already done one course of worm medicine, but she is still having problems with diarrhea. Last night, she vomited but that may be unrelated. Because she is still having diarrhea, the vet suspects another kind of parasite. Now she is on two new meds, one liquid to squirt in her mouth and one powder that goes in her food. (BTW, she loves the food with the powder...so that's not a problem). I don't understand why these worms are so resilent. I want them dead and I want them dead now. She doesn't act sick or lethargic, but I am starting to grow concerned about her health. How long can something like this go on?