They are dogs specially trained for helping people with different motor capabilities and people with hearing deficiency, both in this order of complexity as for demands.In the first case, they are trained for carrying several objects and take them to the disabled person that cannot get them by himself/ herself and for helping in the transportation of the wheelchair by pulling a harness. In the second case, training is simpler and they learn to recognize and differentiate the sound of phones, the door bell and others.In both situations, it complies with the function of companion dog, but there have been many situations in which these dogs have saved their owner’s life in case of an unforeseen situation. One of the most appropriate breeds to carry out this work is the Labrador. The selection process is done in the same way as for guide dogs. There are no preferences as for sex, since all assistance dogs must be sterilized without distinction. Dogs must have a proper behavior, so it is necessary that they receive the obedience training customized for each user. It is important that they obey and perform without making errors. They are taught the specific skills, trying to make the dog have fun and enjoy its work.