The Petes are 10 points behind the Barrie Colts who occupy the last playoff spot in the Eastern Conference with 56 points but the latter has yet to clinch a postseason berth.
Peterborough has six games remaining while Barrie has eight in the regular season.
The Petes started their weekend with a 7-5 win over the last-place Niagara IceDogs in a high-scoring affair at the Peterborough Memorial Centre on Saturday night.
The home team was down 2-1 late in the first period. At the end of the second, they tied the game at three and then exploded with four goals. Braydon McCallum could have scored an empty-net goal for a hat trick but he selflessly gave Ryder McIntyre the honour for his own and first career OHL three-goal game.
The defending OHL champions travelled to Brantford to take on the Bulldogs but lost 7-2.
After the first period, the Petes found themselves in a 2-1 deficit again. They failed to score in the second while letting in a goal for a 3-1 score. Unlike against Niagara, the Petes allowed several goals in the third including a four-goal flurry from the Bulldogs to Peterborough’s one.
The Petes will attempt to keep their playoff hopes alive when they host the Kingston Frontenacs on Wednesday at home. Puck drop is scheduled for 7:05 p.m.