Perrett will join the Bulldogs effective immediately after being granted a release by the Roosters to take up a three and a half year deal.
Perrett is the second Kiwi international to join the Bulldogs in recent weeks, with enigmatic full back Krisnan Inu moving to Belmore from the Warriors last month.
He will be joined at the Bulldogs by his younger brother Lloyd, who will join the club’s Toyota Cup squad.
“With the ongoing injury issues we have been facing with our outside backs Sam is certainly a handy pick up,” said Hasler.
“He is a New Zealand Test player and has a wealth of first grade experience.
“Lloyd is also a solid acquisition for our 20’s program. We look forward to having them both on board.”