The invention relates to an automatically adjustable device (20, 30) for affixing to the nose of animals, which may be used simultaneously for administering medicinal or non-medicinal substances and/or for collecting and transmitting information about the animal by means of onboard sensors, the device (20, 30) being composed of a flexible support body (2, 2') and a pair of adjustable members (1, 1) that are connected by a system of swivel joints (3, 3'), allowing the articulation of the members in all directions. The system of swivel joints (3, 3') enables the adjustable members (I, I') to automatically adjust to the wall of the nasal septum of each animal, which affords greater comfort and offers a larger area of contact between the face of the adjustable members (1, 1') of the device (20, 30) and the nasal mucous membrane of the animal.
