Abstract: A veterinary preparation for fleas is described, which consists of an amount that is effective against fleas of a combination of a compound of formula (I), wherein R1 hydrogen, C1-C6-alkyl or C3-C7-cycloalkyl; R2 is hydrogen, C1-C6-alkyl or C3-C7-cycloalkyl; R3 is hydrogen or C1-C6-alkyl; and A is heterocycly which is unsubstituted or substituted once or repeatedly by identical or different halogen atoms; and a compound of formula (II), wherein X is halogen, X1 is hydrogen or halogen; X2 is hydrogen or halogen; Y is partially or completely halogenated C1-C6-alkoxy, or partially or completely halogenated C1-C6-alkoxy which is interrupted by one oxygen atom, or partially or completely halogenated C2-C6-alkenyl; Y1 is hydrogen or halogen; Y2 is hydrogen or halogen; Y3 is hydrogen or halogen; Z1 is hydrogen or C1-C3-alkyl; and Z2 is hydrogen or C1-C3-alkyl; and a physiologically acceptable formulation excipient.

Abstract: A veterinary preparation for fleas is described, which consists of an amount that is effective against fleas of a combination of a compound of formula (I), wherein R1 hydrogen, C1-C6-alkyl or C3-C7-cycloalkyl; R2 is hydrogen, C1-C6-alkyl or C3-C7-cycloalkyl; R3 is hydrogen or C1-C6-alkyl; and A is heterocycly which is unsubstituted or substituted once or repeatedly by identical or different halogen atoms; and a compound of formula (II), wherein X is halogen, X1 is hydrogen or halogen; X2 is hydrogen or halogen; Y is partially or completely halogenated C1-C6-alkoxy, or partially or completely halogenated C1-C6-alkoxy which is interrupted by one oxygen atom, or partially or completely halogenated C2-C6-alkenyl; Y1 is hydrogen or halogen; Y2 is hydrogen or halogen; Y3 is hydrogen or halogen; Z1 is hydrogen or C1-C3-alkyl; and Z2 is hydrogen or C1-C3-alkyl; and a physiologically acceptable formulation excipient.

Abstract: The compounds of formula I are described ##STR1## wherein Hal is halogen, such as fluorine, chlorine, bromine or iodine;R.sub.1 is hydrogen, C.sub.1 -C.sub.6 alkyl or C.sub.3 -C.sub.7 cycloalkyl;R.sub.2 is hydrogen, C.sub.1 -C.sub.6 alkyl or C.sub.3 -C.sub.7 cycloalkyl, andR.sub.3 is hydrogen or C.sub.1 -C.sub.6 alkyl,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 administered 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.