Jonathan Huberdeau gave the Panthers a 1-0 lead at 1:53 of the first period when he finished a 2-on-1 with Tippett. Nikita Gusev scored 49 seconds later to make it 2-0, getting to a rebound in front with his backhand.
Pavelski cut it to 2-1 with a power-play goal at 12:04. He beat Knight over his glove with a shot near the left post.
Weegar gave Florida a 3-1 lead at 14:13 with a wrist shot off a rush.
Robertson was then credited with the goal that made it 3-2 at 17:16. Roope Hintz pressured Weegar in the Panthers zone, and the defenseman's attempt to clear the puck across the slot deflected in off Knight's skate.
Gustav Forsling scored 45 seconds into the second period to make it 4-2 before Dallas rallied to force overtime.
"We're playing desperate hockey right now," Bowness said. "For us to come back, that's a really good hockey club over there, man. I don't think we had everyone going early in the game, which I don't understand, but as the game went on, we got going and it was a huge comeback in the third period to get those two quick goals. I give us credit for battling back and the desperation needed to get back and get that point, but again, it's just disappointing when you shoot yourself in the foot and you keep losing these games like we did."
NOTES:Seguin had three shots, two hits and one block in 17:09 of ice time. … Barkov's overtime goal was his sixth in the NHL, which is second in Panthers history behind Olli Jokinen's 11. … Florida leads the NHL in wins after regulation (11), and Dallas leads the NHL in losses after regulation (14).