Just as Poor Armando just posted, our cat was running around as if schizophrenic, and panting, and seemingly terrified of everything. I immediately washed it off of her, thinking it was burning, and looked-up “Hartz Ultraguard Pro issues cats” and was glad I washed her off. Familiar symptoms listed. Despite repeated water on her, she almost immediately (within 30 minutes) calmed down, and is back to normal. We put it on her before going to dinner, so it was on for a couple of hours; only lingering (possible) effect has been a more pungent urine, and a little more frequent, thus my return to seeing what lasting effects there may be, and finding this website.