The efficacy of a phyto-aromatic gel (Canidor) was evaluated, in vitro against Psoroptes cuniculi and in vivo against P cuniculi and Otodectes cynotis, in experimentally and naturally infested rabbits and domestic carnivores respectively. At a 1/1 dilution the gel was 100 per cent active in vitro against P cuniculi after less than six hours of contact. In experimentally infested rabbits the gel was administered daily during two periods of five consecutive days, six days apart. A clinical cure was achieved in all the animals, but two harboured a few eggs and mites at the end of the trial. In dogs and cats the active formulation was given for two periods of four consecutive days, seven days apart. Clinical and parasitological examinations 10 and 30 days after initiating the treatment regiment revealed an excellent acaricidal effect.