Putting the P.U. in Puppy

Now, you know how much I love my dog. Seriously, I know I've mentioned it before, but I had no idea I could love anything quite this much. That being said, holy hell my dog smells. Not the normal puppy smell, mind you, but rancid, horrible gas. I thought my sister's dog had such bad gas due to his size, but apparently that's not the issue. How does a dog this small produce smells this bad? I just don't get it. Dis-like.