My dog had an adverse reaction to the Heartworm edible I gave her, do you possibly give one? if so is it maybe related to that? I had to switch brands and she still doesnt feel well for 1 to 2 days after I give it, but it is not as bad as the other brand. Her symptoms were changes in consistency and color and frequency of bowel movements, she didnt eat, and didnt want to be bothered. And she ate grass.