Aim: To study the seroprevalence of 
                              leptospirosis in dogs in Kerala and to identify 
                              the most prevalent serovar. Materials and 
                              Methods: A total of 205 sera collected from 
                              dogs were screened for the presence of antibodies 
                              against leptospirosis by Microscopic Agglutination 
                              Test (MAT). 
               Results: A seroprevalence rate 
                              of 71.12 per cent was observed. Leptospira 
                              interrogans serovar Autumnalis was found to be the 
                              most prevalent serovar followed by Australis, 
                              Pomona, Canicola, Pyrogenes, Icterohaemorrhagiae, 
                              Javanica and Patoc.  
               Conclusions: The 
                              results revealed the high prevalence of anti 
                              leptospiral antibodies in dogs in Kerala. The 
                              emergence of serovars other than the vaccinal 
                              serovars necessitates the incorporation of these 
                              in the vaccines because the immunity against 
                              leptospirosis is serovar specific. 
               Keywords: 
                              canine leptospirosis, MAT, seroprevalence