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the cerberus is a 3 headed dog on mythology island on poptropica
if you mean in mythology island, you dont play a tune for the hydra thats only for the dog you have to jump on their heads if you need help just go to youtube and type in poptropica cheats mythology island
their is no dog island on poptropica!
You can get a hot dog on poptropica in super power island in the city park
you go the the dog and click on it so you can get its whisker
the cerburus is the underworld but first you have to go to hades temple and cross the river of souls
Cerberus is in the underworld. You get to him by going on the boat ride across the river. But you have to watch out because if you fall in you have to start all over again.
There is no dog days island. The island in Poptropica is Wimpy Boardwalk. (see related question)
There's a dog costume in the Poptropica store, but the only dogs are on Spy Island and they are too mean.
To get to Cerberus you have to cross the river Styx.
You need to go to Spy Island. The dogs are in the 2nd building on The Docks. Find one of the 3, and customize as it. You can get the nose, ears, and collar.(with spots) The tail is on the goat dude, and the body is on the Minotaur. ( In Mythology Island)
at the end, you trade the hot dog for the island medallion (with ned noodlehead).