Abstract: The relation between humans and animals is one of the most famous factors for animal welfare in modern housekeeping systems. Words like intuition and empathy in exposure to the horse are difficult to describe, to measure or to teach. In German speaking countries there is the sentence: a good rider knows what the horse will do before it can do it; a bad rider only reacts to what the horse has done. By using the monitoring systemsmardwatch® in connection with chronobiological regulation diagnostics it becomes possible to get insight in the interaction between human and horse.Thesmardwatch® enables measuring of so called psycho-physiologicalparameters likeskin resistance, skin potential, electromyogram and skin temperature, measured 10 times per second; it also registersbehaviorinformation as 3D-acceleration and -position and over this environment information like temperature, noise and brightness. Cutting hooves, cleaning and riding a horse are monitored for example. The data were analyzed under distinct aspectsby chronobiological regulation diagnostics developed byBalzerand Hecht (2000). The physical and vegetative activities of the human and the animalwhere pointed out separately and in their interactionat different levels. Very interesting is the influence of different humans on one horse or the influence of one human on distinct horses. The synchronies or asynchronies in the behavior of different human-horse-pairs could be proved at the level of their vegetative functions. While riding phases of exhaustion of the horse could be shown just as the increasingactivity of the rider to compensate this exhaustion. The method could be a basic approach to develop new training methods which agree with individual rhythms of riders and horses to optimize their achievement.These analysis are not only important for riding, they also give useful directions for daily contact with horses. So it will be possible to detect harmony/disharmony between human and horse for their pairing in order to teach them and to buy or sell a horse, respectively. KW horse, human, chronobiology, synchronisation, smardwatch