The Republic of Ireland international scored from close range and won a penalty, which was eventually turned in by Liam Rosenior after Ben Foster's save from Nikica Jelavic
Liam Rosenior opened the scoring, converting the rebound after Ben Foster saved Nikica Jelavic's penalty.
|VIEW FROM THE KC STADIUM
|By Simon Harrison
It was a 'long' day at the office for West Brom, as Shane Long helped the Tigers to a comfortable 2-0 victory, winning a penalty for his side and converting the second goal.
The Baggies looked out of ideas going forward, with none of Pepe Mel's three substitutes having the desired effect and the visitors look in real trouble - especially following Gareth McAuley's withdrawal through injury.
Steve Bruce's side were organised and disciplined, giving West Brom little more than a sniff, with Long possibly acting as the harbinger of relegation trouble for his former employers.
The result leaves Pepe Mel's West Brom 17th in the Premier League table, just three points ahead of Sunderland who sit one place below them but with two games in hand.
The visitors started brightly as Stephane Sessegnon fizzed an effort narrowly over in the second minute, before Allan McGregor parried away Graham Dorrans' effort 16 minutes later.
David Meyler wasted Hull's first real chance in the 27th minute, somehow directing a free header wide from six yards after Tom Huddlestone's superb delivery from a left-wing corner.
But the hosts took the lead in controversial circumstances in the 32nd minute after Long won a debatable penalty.
The striker, going away from goal, nipped in front of Dawson and then appeared to trail his leg in a bid to manufacture some contact, with match official Chris Foy taking his time before awarding the spot-kick.
Jelavic saw his penalty saved by Foster, but Rosenior was first to react and nodded the ball into the unguarded net.
Foster then tipped Huddlestone's rasping drive over, but Long doubled the advantage from the resulting corner, turning home Davies' header after West Brom failed to properly clear.
Jelavic fired just wide six minutes after the break, and Rosenior cleared a Victor Anichebe header off the line.
Long went agonisingly close to a spectacular third midway through the half, seeing his curling effort from 20 yards crash back off the post with Foster stranded.
West Brom had strong penalty appeals waved away when James Morrison went down under the challenge of Jake Livermore, before Long's eventful day came to a premature end 12 minutes from time as he hobbled off injured after chasing a ball into the corner.