The bachelor thesis focuses on marketing promotion done by e-shops on social networks. These e-shops are all operating in one industry - dog food and are based in the Czech Republic. There are two parts of this thesis. In the first, theoretical one marketing strategies and marketing mix, especially communication and promotion and its tools are defined. In this part of the thesis the most important social networks are listed and described. Towards the end of this part, new trends in marketing are also discussed. The second, practical part consists of an analysis of marketing promotion on social networks carried out by twenty particular e-shops from the dog food industry. Based on this analysis, the last part of the thesis provides recommenda...