My 10 week old pug/chihuahua puppy licked a small piece of brownie.?

I had a single brownie made from a brownie mix in a bowl. I turned and saw him licking it. I don't think he actually ate any because the same amount was in the bowl when i caught him. He's fine, just was all, hay i was trying to eat that. He's a garbage disposal, he'll eat anything. Hair from the floor. Last night he had some of my RB's secret sauce that fell from my sandwich. My question is should i worry even though he just got a small lick, maybe a small piece but i don't think so since he wasn't chewing or smacking. He just looked like oh **** i'm caught. He was right next to me when it happened. I was playing spooky castle on my laptop when i looked over and saw him licking the fork in my bowl.