Huh? Your dog dragged his butt on the floor because the anal glands need to be emptied. Most likely the dog doesn't have worms. My cat was a stray kitten that had a worm and I gave them both dewormer. No sign of worms since then. My dog is outside with me and comes inside at night. I do not have worms. If I do, oh well. That's what herbs are for. Try not to take life too seriously. Trust me. I'm a nurse in a nursing home and took care of my mother with cancer.