The Seahawks agreed to terms on a contract with Dodson on Thursday, Jordan Schultz of BleacherReport.com reports.
Dodson played in all 17 games of the regular season for Buffalo, logging 74 total tackles, 2.5 sacks, two passes defensed, one forced fumble and one fumble recovery.
Dodson (shoulder) is active for Sunday's divisional-round playoff game against the Chiefs.
Dodson (shoulder) was a limited participant in Thursday's practice.
Dodson (shoulder) is inactive for Monday's wild-card round game against the Steelers, Alec White of the Bills' official site reports.
Dodson (shoulder) is listed as questionable for Sunday's wild-card round game against the Steelers, Alec White of the Bills' official site reports.
Dodson (shoulder) was a limited participant at Buffalo's walkthrough practice Wednesday.
Dodson recorded seven tackles (six solo) including a sack and a forced fumble in Sunday's 32-6 win versus the Jets.
Bills general manager Brandon Beane mentioned Dodson by name Tuesday when discussing possible replacements for the vacant starting middle linebacker job following the departure of long-time starter Tremaine Edmunds in free agency, Maddy Glab of the team's official site reports. "I think we got some young guys that have waited their turn and their opportunity," Beane said. "Let's start with Tyrel Dodson who has been here for a while in our system and knows it. I think he filled in admirably when Tremaine missed time. And so, I think he'll have that opportunity."
Dodson and the Bills agreed to terms on a one-year contract Tuesday, the team announced.