How do you get past the underworld dog on mythology island?

1. You get to the dogs on poptropica by sailing on the ship in hade's basement with the pirate looking guy. You must be careful by passing the falling piece of rocks, the hot goo-skull, and the alligator. If not you'll have to try again. Its pretty tricky but if you dont give up you can do it!

2. You exit the boat and go right. There will be the three headed dog. I dont know how to get them to fall asleep but if I figure out, I promise I'll write how to!