Faitala-Mariner, who debuted in the NRL for the Warriors back in 2015, made 16 appearances for the Bulldogs last season, many of them off the bench.
The hard-running 24-year-old second rower was a major impact player with his aggressive running style and ability to offload.
Faitala-Mariner has had his contract extended for an additional year until the end of the 2020 season.
19-year-old halfback Brandon Wakeham has received a two-year contract extension, keeping him at the Bulldogs until the end of the 2020 season.
The local junior from Chester Hill, is a graduate of the club’s Harold Matthews, SG Ball and Youth High-Performance teams and was named SG Ball Player of the Season in 2017.