Baby food or puppy food?

Last night Thad officially ate his first piece of dog food! EWWWWWWWWW!!!!!! He dumped Chauchi's food dish and I caught him (I thought) before he put anything in his mouth. The little stinker had one hidden in his hand. I brought him back to the living room and I went to the kitchen to clean up the mess. I noticed him chewing on something and he had brown drool on his face and shirt. I was positive it wasn't dog food until I dug it out of his mouth and found a half eaten kibble!!!! It made me squirm! I'm sure it won't be his last but how could that taste good that he would want to keep it in his mouth.