Yes, around the 13th day Lexi will flagg Romeo and he don't mess around he gets the job done. Lexi is a real passive and shy dog but not to mating.Well on her 1st heat she really was confused and let romeo take the lead; and it was his first time also.But now that it is the 2nd heat to breed they both know what to do and Romeo will not try to mount her until she lets him know . We just had our 2nd litter with lexi which is 6lbs. She had 5 the 1st time and 4 this time.They are so cute....