A launcher for remotely treating an animal is described. The launcher having a first chamber adapted to receive a first dosage projectile having a first calibre, a second chamber adapted to receive a second dosage projectile having a second caliber smaller than the first calibre, a launcher barrel comprising a first cooperating caliber facilitating launching of the first dosage projectile, an adaptor comprising a second cooperating caliber facilitating launching of the second dosage projectile, and a propulsion assembly for propelling the dosage projectiles. An adaptor is also described, for adapting the launcher to launch dosage projectiles of calibers other than those associated with the launcher barrel.
