The aim of the thesis was to teach a mare a useful trick, namely to put her head in the halter held with one hand when the command "aftra" is given, using positive reinforcers and following the principles of the Liberty method, i.e. without being forced. In this way the mare would put the halter on by herself, so to speak. This exercise is very useful when we have only one hand free, if the horse is tall and the handler is short, or if the horse is raising its head while we are putting the halter on. The mare was no stranger to this learning principle, as she had already learned several tricks before learning this one. The training was carried out in five steps. In the first step, the mare was rewarded only for touching the halter, while in the second step she had to touch the halter when the voice command ''aftra'' was given. In the third step, she was taught to put her head into the wide part of the halter on the command ''aftra'', and in the fourth step, she had to put her head through the nasal part of the halter on the command ''aftra''. In the fifth step, the mare learned to wait until we placed the halter properly behind her ears. By increasing the difficulty level in several steps, the mare successfully learned the trick. During the learning process there were two minor complications. In the second step, without being told to do so, the mare started doing the exercise and other tricks on her own to get the treats sooner. The fourth step also caused problems because at first the mare did not understand exactly what we wanted her to do. We assumed it would take 11 weeks to learn the trick. Despite the complications, the mare mastered the task in just over 7 weeks. We also successfully eliminated the unwanted lifting of the head when putting on the halter.
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