good to be picky

It turned out I am a bad "mum" to Cartman. The other day, Cartman didn't eat the food in the bowl for some time, I was puzzled so instead of his normal food, I fed him more treats, those beef jerky and dry chicken breast which made him vomit last time. He enjoyed those. I was thinking, what a spoiled guy he is going to become... Then, sometime at night, while sitting around his food bowl, I suddenly noticed a very foul smell. It took some time for me to locate the source of the smell, well, I do not have Cartman's nose, it was the food. I haven't changed his food for maybe two days, I just added on more food and more water. Well, it was certainly not a good idea to be lazy. THAT WAS WHY HE STOPPED EATING, BECAUSE THE FOOD WAS SPOILED. As soon as I put down a bowl of fresh food, Cartman dig in and started to eat. I was so happy on 1) he was too picky to eat the bad food, so he didn't become sick because of my mistake; 2) he likes his food the same as his treat; 3) he was really hungry and so happy to be fed properly at last. There was no need to wash his bowl for this fed. And the second serve was immediately in order.