Jeez it's ridiculously loud, the poor hound thinks there's something wrong with me I think. And I'm still hungry and lentils are supposed to fill you up, I ate a whole tinfull with lots of cherry toms and cucumber, this dieting lark is crap. I give up!
Do you mean your stomach growling or the dog staring at you? lol!
Perhaps you gulped in a bit to much air when you were eating. Sometimes we gulp our food because we've left too long in between meals.
I always give my friends cucumber sandwiches. I know they like them. They keep coming back! (Cucumber is a gas-producing food, hence your rumbling belly.