Based on several issues Jennie and Queen Eva seem to be having that they never had before (excessive hairball puking, constipation, some loose stool) I have stopped the S&C a few months early. I believe the bags of "old formula" I stocked up on are in fact, new formula in old bags.
I wrote to S&C with this additional complaint and was told I had to contact the store I bought them from. I have two opened bags (one had very large bone pieces in it, which Queen Eva left in her dish and Jennie choked on, so I opened a different bag) and four unopened. I wrote to the on line store I bought them from with the whole story (long e mail) and they were entirely sympathetic and have refunded me for all 6 bags!
Sadly S&C are getting new customers all the time, if you read the reviews, and people aren't realizing that the formula has changed and that pea fiber is now the 5th ingredient and toxic fake K is still in there.