Havanese are a gentle breed and can be prone to anxiety or fearful behavior if under-socialized or exposed to negative experiences. They do best with positive reinforcement and do not respond well to punishment such as yelling or hitting.
While Havanese already require a gentle hand, it is even more important to be mindful of your emotions or actions with a fearful Havanese. Negative behavior on your part could exacerbate their fearful response.
Read more at HavaneseTraining.com.