Jaroslav Halak stopped 20 shots for the Blues, who were shut out for the second time at home this preseason. St. Louis finished with five wins in eight games.
Blues coach Davis Payne is just glad to see the preseason end.
"We still wanted to see some impressions, and unfortunately some of the guys we called up didn't leave great ones," Payne said. "We've got some moves we've got to make, we'll get the roster down and get to work."
Dowell scooped a shot over Halak for a 1-0 lead at 5:25 of the first. Wathier scored on the Stars' first power play, deflecting Daley's shot from the point screening Halak at 8:29 of the first for a 2-0 lead.
The Blues also lost forward B.J. Crombeen, who broke his left shoulder blade in the third period and is out indefinitely.
Material from wire services was used in this report
|Jake Dowell (1) Wrist shot - ASST: Francis Wathier (1), Sheldon Souray (1)|
1 - 0 DAL
|PPG - Francis Wathier (1) Deflected shot - ASST: Trevor Daley (1), Travis Morin (1)|
2 - 0 DAL
|Vernon Fiddler (1) Wrist shot - ASST: Trevor Daley (2), Eric Godard (1)|
3 - 0 DAL
|Tomas Vincour (1) Wrist shot - ASST: Steve Ott (1), Vernon Fiddler (1)|
4 - 0 DAL
|Mark Cundari Boarding - 2 min against Toby Petersen|
|Adam Cracknell Hooking - 2 min against Travis Morin|
|Philip Larsen Hooking - 2 min against T.J. Oshie|
|Brett Sterling Too many men on the ice - 2 min|
|Philip Larsen Tripping - 2 min against Adam Cracknell|
|Ian Cole Elbowing - 2 min against Krys Barch|
|Nicklas Grossmann Roughing - 2 min against Philip McRae|
|Steve Ott Interference - 2 min against Philip McRae|
|Steve Ott Slashing - 2 min against Kevin Shattenkirk|
|Scott Nichol Roughing - 2 min against Steve Ott|
|Kevin Shattenkirk Slashing - 2 min against Steve Ott|
|Sheldon Souray Roughing - 2 min against Vladimir Sobotka|