ABSTRACT - 592985 The disclosure relates to dimericl-arylpyrazole compounds of formula (I), and salts thereof, and the use of these compounds against ectoparasites such as insects, arthropods and acarina. The resulting compounds may be used in veterinary formulations such as, for example, spot-on and pour-on formulations, which may be used for treatment, controlling and preventing of parasitic infections in warm-blooded animals and birds. A method for controlling pests is also disclosed, wherein a compound of formula (I) or a composition thereof is allowed to act on the pests and/or their environment or on the plants, plant parts, seeds, soils, areas, materials or spaces to be kept free from them.
