Clear the Rebirth Ending to get the DOG Key in the Doghouse near Jack's Inn in Southvale Silent Hill.
As in the PlayStation 2 version of the game, beat the game ''Letter from Silent Heaven'' with all 5 endings on one save and the blurry signs around town are now clear.
To get the chainsaw beat the Main Scenario and then beat the Sub-Scenario. Then start another new game and go down the path and you should hear a weird noise (not the one to scare you) then across form Silent Hill Ranch the is there chainsaw on the logs.
In a Replay game, go to the Texxon Gas Station. Near the Food Store of the Station, look in a Magazine Display Case for the Book of Memories.
Unlik the other traditional endings, the Rebirth Ending can only be obtained in a REPLAY game. Collect the Obsidian Goblet, the White Chrism, the Book of Memories and the Book of Crimson Ceremony and once you beat the game, the ending will be the Rebirth Ending.