I never use this thing anymore. Sigh. Well, after rebounding a little my cat got sick again and we took her to our regular vet that had reopened post-holidays and found out she had cancer, so we elected to have her put down. It was a hard decision but I couldn't afford kitty chemo, if it would even WORK, and I didn't want her to suffer. I miss my little Zelda so much. We would have had her for four years come Valentine's Day.