We did use it this Spring when Abby was suffering from kidney stones. OMG...the 1st one she had...she puked up brown slime for hours on end. We ended up having to cut down & just give her 1/4 of a Rimadyl at a time so it didn't upset her...darn thing was, she was too scared to try & pee if she didn't take it...what a scary time we had with her. I spent one entire night sitting outside with her when she was uncomfortable & pacing. Glad that episode is behind us...