Dog not eating

Hi, I am new here, and I didn't know where to post this. I hope this is ok. My 7 month old puppy is not eating his food. He used to scarf down his food. We bought Iams maybe last week and he ate it, but now he isn't eating it. So, I went out and bought Purina which is what he was eating in the first place. He doesn't touch it. He is still drinking and eating treats though. Any advice won't be great! Also, I have 4 cats and they eat wet food and he loves to try to get theirs. Could that be a reason why he isn't eating his?

He hasn't eaten in like 2 days!!!! (Only some chicken and treats really)
Please HELP!!!

~Tami

Please have a vet checkup on your puppy and discuss the eating issue with them. It is very important to rule out serious health issues before you decide he's just being finicky.