Simply roll your mouse over what Lassie's barking about to reveal its true meaning!

Lassie: BARK, BARK, BARK.
Billy: Hiya boy! What's wrong? Something up?
Lassie: BARK.
Billy: Trouble down at the old mill you say?
Lassie: RUFF, RUFF. BARK.
Billy: Mill's on fire?!? Well we'll need to get the fire brigade!
Lassie: BARK. WOOF, BARK.
Billy: Thanks boy. You saved the day!
Lassie: WOOF.
Jimmy: Hey doggie.
Lassie: BARK
Jimmy: Doggie wanna play fetch?
Lassie: WOOF
Jimmy: Whoa. Something up boy? What is it? What's going on?
Lassie: WOOF, WOOF. BARK.
Jimmy: Tommy fell down the well and can't get out?
Lassie: WOOF

Tommy: Hey boy, we need your help. Some man just kidnapped Suzie!
Lassie: WOOF, WOOF.
Tommy: Here, we managed to get a shirt of his. Follow the scent.
Lassie: RUFF.
Tommy: You got it yet, boy?
Lassie: WOOF WOOF
Tommy: Go find him boy. Go get him.
Lassie: BARK
Lassie: RUFF
Mr. Thomkins: Trouble at the old mill?
Lassie: RUFF
Mr. Thomkins: What's wrong boy? It's on fire?
Lassie: RUFF. RUFF.
Jimmy: GO BOY, GET HELP! GRANDMA FELL!!!
Lassie: WOOF.