A detection system (101, 101b) of enteric diseases in animals includes a sensor device (102) having suction (103) for suctioning air from the animals' environment (11, 12). A sensor is (104) configured to determine information about the type and concentration of smelling molecules in the air and further configured to emit a signal representative of the information of smelling molecules. A transmission device (105) is configured to convey the signal representative of smelling molecules. A self-learning processing device (108) is configured to receive and process the signal representative of smelling molecules, and to detect a risk of enteric diseases in the animals associated with the information about the type and concentration of the smelling molecules. A signaling device (111) is configured to report to a user (10) the risk of enteric diseases in the animals, before the enteric diseases arise. A relative method detects enteric diseases in animals.