ABSTRACTThe aerobic bacterial flora (excludingMycoplasmaspp.) of the vagina of sixty‐two clinically normal bitches was determined and the species most frequently isolated, in decreasing order, were:Escherichia colt,Streptococcus‘viridans’,Staphylococcus aureusandStreptococcus cards.From the vaginal exudates of seventy‐two bitches with vaginitis, the order of frequency was:E. coli,Strep, canisandStaph. aureus.The only consistent difference between the bacterial flora from the two sources was the relatively higher numbers of bacteria in the vaginal e