It seems to be working, but still a bit early to give a true evaluation. My cat was vomiting daily, and at least that has stopped since administering Blisso. He still drinks often, but that has slightly changed too, not drinking quite as much. As for the grooming, that is still frequent, but to be fair, he has always done that. He likes to roll in the dirt to scratch his back (and, perhaps, sooth any flea bites he may have), I don't know if that'll change. Overall, I would give this product an A...