In today's society dogs have become more popular as pets. This increase may result in more dog owners with lack of knowledge on how to care for them. A major social issue is the societies viewpoint to fighting breeds and similar breeds with an aggressive behavior. We experience that there is an increasing problem with aggressive dogs and their owners in Sweden that needs to be taken seriously.The aim of our study is to find out if people in Sweden think there is a problem with aggressive dogs. The study has been carried out as a literature study and a survey. The survey sent to 87 individuals who hold knowledge about dogs. 49 individuals answered the survey and the answers were analyzed in the statistic program SPSS.The results showed that many thought it was better to have a positive learning then punishment that can reinforce aggression. Survey responses thought there was no difference between first-time dog owners and owners who have owned a dog before. They thought it has to do with how to embrace knowledge and personal qualification. Based upon the study a guideline for a dog license was developed as many people participating in the survey found the idea of a dog license an appropriate solution to reduce the problem. A guideline for an education material for children in elementary schools was also produced.