The Perfect Castaway is episode 12 of family guy season 04. It was originally aired on September 18, 2005.

When Peter and the guys go on a fishing trip so Peter can save his failing business, they end up in choppy waters that leave them stranded on a desert island.  Months later, the guys are rescued from the island and Peter returns home to discover the new man of the house has a bark that’s worse than his bite.