The formula was changed drastically this summer. In spite of Vets'-Best claiming there is only "very little change", it has changed A LOT.
The active ingredients remain the same, but it's possible the source of those ingredients have changed. The inactive ingredients now read (taken straight from the bottle and they have now sent me two different batches for free after my complaints, and the ingredients read exactly the same as the first bottle I paid for with the change:
Apple Fiber Powder, Calcium Carbonate, Cellulose, Liver Powder (I've been told by V-B the liver source is pork), Magnesium Stearate, Natural Flavor, Silicon Dioxide, Yeast (Torula)
Old formula:
Apple Powder, Brewer's yeast, Calcium Carbonate, chicken (dried), Liver (defatted pork), magnesium sterate, Natural flavorings, Yeast (Torula)
Many people from the IBD group are finding their cats will not longer go near it.
What I found was that, after a very slow transition from old to new, once all on new Mazy cat began regurgitating every two or three days.
I have taken her complete off it. I thought I would continue to use it for Jennie and Queen Eva but I've changed my mind. I don't want them having sawdust, even only once in a while. I don't know what I will do with the three unopened bottles and the one opened bottle (two paid for, two "complementary".
I think V-B will find their high sales will fall off quite a bit. Sadly, eventually they will find new customers, and those customers won't have experienced the difference.