I just took my & year old cat to the vet because he peed out of the blue on my roomates coat. They asked what I am feeding him and I said Iams. He told me to switch to Eukanuba because they have been finding that recently, the Iams has been badly affecting the cats urinary tract or something on that order. I wish I would have written it down, exactly what he said. If anyone had heard anything about this please let me know. He mentioned something about store bought Iams (as opposed to what?) and the chemicals and particles used in it are bad for the cats. Now he didn't specify if I shouldn't use it because my cat is older and it can affect him differently or what. He knows I have 5 cats and he mentioned nothing about the other ones not being able to eat Iams. So yeah if someone knows anything about this, I would appreciate it. Thanks.