My 2 old boys (14 & 12yo) have had Iams before, not had a problem with it. My oldest cat has got really picky over his wet food, but was eating cruchies loads. So, I bought some Senior Iams and he has been sick after each time of eating it. I hadn't noticed the younger cat being sick, but he was still eating wet and is much more outdoors-y anyway.
Being a bit crazy today, I had just left the Iams down. And I've just had to scoop up the youngest cat as he was being sick on my cream sofa and he has definitely eaten Iams today.
It must be the food, right? Or am I missing something??