This paper analyses environment in fast (gazelles) and slow growing companies (mices) using Entrepreneurialorientation (EO) dimensions and business performance in terms of sales and employee growth. The research isdone using information on 178 small and medium enterprises (SMEs) in Bosnia and Herzegovina. We find thatEO dimensions are more present in gazelles than in mices. We show a small to moderate significant correlationbetween EO dimensions and business performance of gazelles and mices. Also, any change in sales growth andemployee growth might be associated with variability in innovation, risk taking and firm’s age.