Our puss overgrooms and has done for a while.
We tried a feliway diffuser about a year ago and it didn't make any difference. The vet suggested using two as we have high ceilings: we have had them for nearly a month.
I can't see any difference in her fur, but is it too soon to give up?
Feliway isn't cheap, but I would do anything for the little furball if I thought it would help.