1-n-(halo-3-pyridylmethyl)-n-methylamino-1-alkylamino-2- nitroethylene derivatives for controlling fleas in domestic animals

Abstract From the Canadian patent

The compounds of formula I are described wherein, Hal is halogen, such as fluorine chlorine, bromine or iodine;, R1 is hydrogen C1-C6alkyl or C3-C7cycloalkyl;, R2 is hydrogen C1-C6alkyl or C3-C7cycloalkyl, and, R3 is hydrogen or C1-C6alkyl for use in a method of controlling fleas in domestic animals especially in , dogs and cats, wherein systemic administration is preferred. The compounds of formula I are adminis-, tered in an amount effective against fleas via the digestive tract or via the blood of the host, animal and thus systemically to the domestic animal especially the dog or the , cat.