The aim of this retrospective study was to evaluate effects of breed, parity and season on reproductive parameters in bitches reared under temperate climate. Breeding and pregnancy statuses, proestrus, estrus and pregnancy durations, litter size and cycle interval were compiled from German Shepherds (GS, n=34), Labrador Retrievers (LA, n=23), Belgian Malinois (BM, n=13) and Pointers (PO, n=9) up to 10th parities. \nParity was negatively correlated with the cycle interval (r=-0.18) and the proestrus duration (r=-0.09) as well as the litter size (r=-0.20), but not correlated with the estrus and pregnancy durations. The mean age at first breeding (464.8±26.2 d, mean±SD) and the pregnancy rate (74.6%) were not different among breeds. The pregnancy duration became shortened as the number of the puppies born in each whelping increased (P<0.008). The cycle interval varied by the breed (208.2, 215.1, 208.6 and 237.0 d for GS, LA, BM and PO, respectively, P<0.01) and decreased linearly from 241.1 to 202.0 d as parity increased from 1 to 10 (P<0.04). The season did not affect the cycle interval, proestrus and estrus length (P>0.05). Reproductive parameters varied among GS, LA, BM and PO bitches reared in Turkey. The effect of seasonal variation was negligible.