My 2 1/2 yr old Cocker Amber is suffering with fleas, she reacts quite badly to her (an poss other things) I have tried EVERYTHING natural, from Cider Vinegar to DE powder and everything in between, I am thinking now that very reluctantly I am going to bite the bullet and go for a spot on. Silly question but does anyone know which is the LEAST harmful, as I know they all cause problems long term, anything in food is a no no as my girl is so fussy and thats when she isnt off food with Seasons and phantom pregnancies , so her eating isnt reliable enough and she wont touch anything thats had added extras