When an assistance dog association currently purchases a puppy, in many cases it has only a 40 per cent chance of being successfully trained. That low success rate is a waste of the time and budget invested and remains stable from generation to generation, although the main causes (orthopaedic disorders and behavioural problems) have a hereditary basis.To increase the success rate of puppies, we are working with a breeding programme where the best parent dogs are selected to build a population with fewer congenital problems. Abroad, similar projects have already proven their effect (such as Guide Dogs National Breeding Centre, The seeing eye, Guiding eyes, Cesecah...).