An ectoparasiticidal composition is provided that comprises a mixture of acarrier and an active with anemulsify-ing agent. The carrier comprises non- volatile low viscosity siloxaneand the active comprises a non-volatile high viscositysilox-ane. The low viscosity siloxane and the high viscosity siloxane bothhave a closed cup flash point of at least 100° C. Preferably,both the low viscosity siloxane and the high viscosity siloxane comprise adimeticone or a dimeticonol or a mixture of same, thethe low viscosity siloxane having a viscosity in the range of 5 to 1000centistokes inclusive and the high viscosity siloxane havinga viscosity of at least 1000 centistokes.
