touch the invention also relates to such a method with a therapeutic aim intended for the treatment and prevention of parasitoses having pathogenic consequences in another preferred embodiment this provides for a composition for combating fleas in small mammals in particular dogs and cats characterized in that it contains at least one compound of formula ii as defined above the formulations of the present invention provide for the topical administration of a concentrated solution suspension microemulsion or emulsion for intermittent application to a spot on the animal generally between the two shoulders solution of spot on type it has been discovered that the inventive formulations are especially active against parasites when the formulations are applied to animals such as mammals especially dogs cats sheep pigs cattle and horses and birds especially chickens turkeys and quails the ectoparasiticidal combination can advantageously be present in this formulation in a proportion of about 1 to about 20 preferably of about 5 to about 15 percentages as weight by volume w v the liquid carrier vehicle comprises a pharmaceutically or veterinary acceptable organic solvent and optionally an organic cosolvent also contemplated are the pharmaceutically or veterinary acceptable acid or base salts where applicable of the active compounds provided for herein the term u201c acid u201d contemplates all pharmaceutically or veterinary acceptable inorganic or organic acids inorganic acids include mineral acids such as hydrohalic acids such as hydrobromic and hydrochloric acids sulfuric acids phosphoric acids and nitric acids organic acids include all pharmaceutically or veterinary acceptable aliphatic alicyclic and aromatic carboxylic acids dicarboxylic acids tricarboxylic acids and fatty acids preferred acids are straight chain or branched saturated or unsaturated c 1 c 20 aliphatic carboxylic acids which are optionally substituted by halogen or by hydroxyl groups or.