Portable inhaler (1) for propellant-free dosed nebulization of a medicament preparation (2), preferably for an animal, particularly a horse (32), having a pressure generator (5), which preferably is in the form of a pump and / or that is preferably mechanically manipulated, and that has an expulsion nozzle (12) for the administration of the nebulized drug preparation (2) in the form of an aerosol (14), the pressure generator (5) having a guide (7) for the generation of pressure and nebulization, the inhaler (1) having a tensioning device (38) for tensioning the guide spring (7), characterized in that the inhaler (1) or the tensioning device (38) are constructed to be operable with one hand, in which the tensioning device (38) comprises a manually operable actuator element (39) that is pivotable during its operation, in which the tensioning device (38) comprises an element of aco support (43) to convert the movement of the actuator element (39) during its operation into a guide movement for tensioning the guide spring (7), and in which the coupling element (43) is configured to convert the movement pivoting of the actuator element (39) in a linear movement.Inhalador portátil (1) para la nebulización dosificada exenta de propulsor de una preparación medicamentosa (2), preferentemente para un animal, particularmente un caballo (32), que tiene un generador de presión (5), que preferentemente esta forma de una bomba y/o que preferentemente se manipula mecánicamente, y que tiene una boquilla de expulsión (12) para la administración de la preparación medicamentosa nebulizada (2) en forma de un aerosol (14), el generador de presión (5) que tiene un resorte de guía (7) para la generación de la presión y la nebulización, el inhalador (1) que tiene un dispositivo tensor (38) para el tensado del resorte de guía (7), caracterizado por que el inhalador (1) o el dispositivo tensor (38) están construidos para ser operables con una mano, en el que el dispositivo tensor (38) comprend
