"We just seem to lack concentration at key moments during games," Dowie said after the 2-1 reverse at Craven Cottage.
"We were on top too often but didn't take our chances.
"We are still relying too much on Darren Bent. He scored a top goal tonight with only a half-chance and we need others to start chipping in with goals.
"The Watford game this weekend is now a massive game for us.
"I'm used to the pressure with this job, but it's increasing every time we don't get a result.