preferred dosage of avermectin e g ivermectin is about 5 7 u03bcg kg body weight of the animal administered monthly preferably 5 5 6 5 u03bcg kg body weight with 6 u03bcg kg body weight as a preferred example a preferred dosage of anthelmintic pyrimidines e g pyrantel pamoate is about 4 25 5 75 mg kg body weight administered monthly preferably 4 75 5 25 mg kg with 5 mg as a preferred example a preferred dosage of hexahydropyrazinoisoquinaline e g praziquantel is about 4 25 5 75 mg kg body weight administered monthly preferably 4 75 5 25 mg kg with 5 mg as a preferred example a preferred dosage of benzimidazole e g fenbendazole is about 37 63 mg kg body weight administered monthly preferably 42 58 mg kg with 50 mg as a preferred example a preferred dosage of febantel is about 18 32 mg kg body weight administered monthly preferably 21 29 mg kg with 25 mg as a preferred example to prepare solid preparations the active compound should be mixed with suitable excipients if appropriate with addition of auxiliaries and converted to the form desired a preparing a first and second a first second and third or a first second third and fourth or more combination including the first and second the first second and third or the first second third and fourth active ingredient respectively b combining the combinations from a with dispersing agents to form two three or four separate.