I have a mystery to solve around Laxatone Tuna. I purchased a tube and my cat went nuts over it. She just couldn't get enough. Brushing her and cutting her nails suddenly became a breeze after years of struggle. I rushed out a bought 2 more tubes (with different lot #s), only to find that she turned her nose up at the other two. I'm almost out of the original tube and am desperate to find more of the same lot #3915. I contacted the manufacturer and they don't see any on the west coast, and, they swear they haven't changed the formula. I tried two more new tubes (different lot #s). Again, she wouldn't touch them but goes right for the original. (To my human nose, the others do have a stronger molasses smell.) Any thoughts? And better yet, does anyone have any unopened tubes with this lot number? Am indebted to anyone who can help!