Hi...Thanks for your help...I do worm every 3 months and frontline every 4/5 weeks- outdoor cats in wild wales !- what I meant was, can u worm and de flea on the same day ? There doesnt seem to be much info on this subject anywhere, and I don't want to harm them !!! I have a ginger tom (sunny) who was rescued from a hedge (thrown there by a passing car)...he is gorgeous..a very pale apricot with deep gold eyes. The other beauty is a bengal cross, called Luna... she is very stand offish and is very much a one person cat, if anyone strokes her that isnt me , she licks clean where they have touched !!! But she is such a character ... They both used to be house cats, but we moved to wales so they could start going out...now they are in cat paradise exploring the hill behind, hunting ,climbing trees and sunbathing !!! Thanks for your help, everyone that has replied, Jax. XX