In my case:
1. To prevent them from getting finicky and addicted to a single flavour
2. I have him rotate between different brands, just in case there's a recall, kitty's food supply won't be affected and no switching new food problem.
3. Different brand have different formula, just wanna be sure their nutrients are all covered.
Maybe I am very much influenced by my fish keeping style.
I know of some cats that had been fed only friskies since young and nothingelse, when given other premium food, they simply refused and we all know friskies is not an ideal food. But well, I guess different cats have different taste buds, thank goodness ET isn't all that finicky. He will finish 1can in 5-6meals before I open another can of different flavour. He gets different brands of kibbles too, though I am now trying to replace that with wet.
Last edited by snowy; 11-20-2012 at 12:06 AM.