We have two dogs, with different temperaments. We have Gnarly, the older (about 3 1/2 years) Newfoundland. He's pretty laid back, until Rosie, the six month old Lab gets him going.
Gnarly waits for his dinner, lying quietly on the floor:
Rosie sits right underfoot, waiting expectantly:
You can almost see the worried look on her face, as if she might not get fed!