Cerberus is a three headed dog in Hade's Castle.You can't get past him without the reed flute and the first reed flute song that the statue gives you.To get to Cerberus get a ride in the boat to cross the acid sea. If you touch Cerberus all you'll get is a CHOMP and get knocked down. Play the reed flute and Cerberus will fall asleep. Don't say "I don't even get anything!" Click on one of Cerberus' heads and you will recive a whisker.
Cerberus is a 3-headed dog that you will need a whisker from on Poptropica, for Mythology.