A portable dispensing device for administering fluids intended for animals comprising a backpack with a main compartment delimited by a rear wall configured to come into contact with the back of the user, an outer wall arranged opposite the rear wall and a side wall linking the rear and outer walls, in addition to a flexible pouch containing the fluid to be administered, placed in said main compartment, in which at least the part of the outer wall of the backpack opposite said pouch is made from a rigid material in order to form a shockproof protection and the pouch is removably secured to the rear wall.