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An attempt was made to analyse the effect of season, age sex and breed on the occurrence of microfilariosis in dogs scanning the records of Veterinary Hospital, Mannuthy fora 12 month period. Out of 8503 canine cases presented to the hospital, 145 were positive for microfilariae showing an overall prevalence of 1.70 per cent. The highest prevalence was recorded during winter months from December to February (2.07%). The prevalence rate was higher in males (1.90 %)n than in females (1.50%) and common in adults (3.08%) than in puppies (0.03%). The difference in prevalence observed in different age groups was statistically significant (P<0.05). The infection was found more in Boxers (8.00 %) and less in Pugs (0.8%). The important symptoms recorded were pyrexia, conjunctivitis, dermatitis, anorexia, limb oedema, cough and vomiting