Barnsley moved as much as fourth in Sky Wager League One after a 2-0 residence win over South Yorkshire rivals Rotherham, who are actually winless towards the Tykes since 1982.
Jon Russell opened the scoring earlier than Stephen Humphrys got here off the bench to double the lead late on.
Joe Rafferty struck a fierce effort goalwards inside three minutes for the Millers, however the onrushing Barnsley defenders had been capable of block.
The hosts took the lead after 32 minutes via Russell.
After Dawson pulled off a spectacular save to disclaim his headed effort, he pounced on the free ball and made no mistake to present his facet the benefit.
It appeared as if Rotherham had been going to stage with 18 minutes to play when Jack Holmes was discovered on the again put up, however Barnsley goalkeeper Ben Killip recovered properly to maintain a close-range effort out.
Humphrys added a second for the Tykes with 4 minutes remaining when he discovered himself behind the final line of the Rotherham defence and smashed into the bottom-right nook from exterior the field.
