After the 75th Grey Cup victory, Dunigan tried pursuing a Major League Baseball career. He worked with a scout from the California Angels, then showed up in Florida during spring training. He was hoping to catch on with the Montreal Expos. He was signed to a Class A contract, but then released on the last day. While Edmonton held on to his rights, they traded him to the British Columbia Lions in a remarkable seven for one trade. He led the Lions to victory in their last eight games, and to the Grey Cup. They lost to Winnipeg 22-21. His second year in Vancouver produced his first losing season, as the team fell to 7-11. He did throw for a career-high 27 touchdowns. However, new management came in, and Dunigan was the first one to go in another seven for one trade, to the Toronto Argonauts. When he arrived in Toronto, they made the playoffs in 1990, but lost in the Division Final. However, 1991 proved to be a memorable year for the CFL and Argonauts. Canadian actor and comedian John Candy, along with hockey great Wayne Gretzky, and Los Angeles Kings owner Bruce McNall purchased the Argos. Toronto then made noise by signing Notre Dame receiver Raghib "Rocket" Ismail. The Rocket, along with Dunigan and running back Michael "Pinball" Clemons led Toronto to a 13-5 record. After a first round bye, the Argos won against Winnipeg in front of a packed out SkyDome, and advanced to the Grey Cup. However, in that playoff game, Dunigan broke his collarbone. He was able to throw the length of a hotel ballroom after doctors deadened his shoulder. In minus 19 degree weather, he threw two touchdowns and won his second Grey Cup. He left for the Winnipeg Blue Bombers the following season, where he spent the next three years. The Bombers went to the Grey Cup in 1992, only to lose to the Calgary Stampeders. They returned to the Grey Cup in 1993, and lost to the Edmonton Eskimos. Dunigan watched the 1993 Grey Cup on crutches, after tearing his Achilles tendon. However, the season saw him break a club record throwing for 36 touchdowns. On July 13, 1994 he made pro football history when he passed for 713 yards in a 50-35 victory over his former team, the Eskimos. In 1995, the CFL made an attempt to further expand into the