The dominant organizational form of vocational education and training in Switzerland is the dual-track system, in which trainees sign an apprenticeship contract with a training company. Notably, 10% to 40% of those contracts are terminated prematurely each year, depending on region and occupational category, which is an important topic of concern for politics, practice and research. Thus, premature contract terminations (PCTs) are associated with high costs for society, companies, and young people. This study of 335 companies involving cooks and painters from German-speaking Switzerland aims to investigate the relationship between training quality and PCT. Of these companies, 136 had been affected by a PCT, and 199 had not. The results indicate that training at the workplace is universally of rather high quality. In line with the previous literature, trainees evaluate quality significantly lower than trainers. Furthermore, there are considerable differences between the two occupations: cooks evaluate their training quality more positively than painters. Moreover, cluster analyses indicate that high quality training can help companies avoid PCTs.