My damn beloved cats have caused a flea outbreak in my home - again! Frontlined them, hoovered, sprayed the house but DD and I are still finding them. DH is oblivious and just keeps behaving as if I'm being unreasonable when I tell him he's got to help me hoover or clear the clutter off the floor etc (I'm 29 weeks pg so I can't manage lots of lifting etc). 
He told me that he's been told that frontline isn't effective as the fleas have learned to tolerate it - anybody else heard this?