Is It Guaranteed Pregnancy If Dogs Tie. In many cases dogs only need to tie once when breeding for a successful impregnation to occur and for the female dog to become pregnant. It is possible, and even likely, that your female became pregnant, even without a tie during mating, as long as the male ejaculated prior to withdrawal.
It is important to note that pregnancy can occur without a tie. A whopping 40% of female dogs will fall pregnant after just one mating session. Whether a tie takes hold after some time depends on whether the male dog or the female dog is stuck.