Yes, a female dog can get pregnant even if a "lock" (also called a tie) doesn't occur during mating, provided ejaculation has occurred.
While the "lock," where the male and female dogs remain physically connected after mating, is often considered a sign of successful mating, it's not strictly necessary for fertilization. The lock happens due to swelling of the bulbus glandis in the male dog's penis and constriction of the female's vaginal muscles.
Here's a breakdown:
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Ejaculation is Key: Pregnancy occurs when sperm fertilizes the egg. If the male dog ejaculates inside the female, pregnancy is possible regardless of whether a lock happens.
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Slip Mating: A mating without a lock is sometimes referred to as a "slip mating."
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Fertility Rate: A slip mating might have a slightly lower chance of resulting in pregnancy compared to a mating with a lock. This is because there can sometimes be spillage of semen when the dogs separate before the lock would typically occur. However, it is still quite possible for the female to become pregnant.
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What to Do After Mating: If you're unsure if ejaculation occurred, consult with your veterinarian. They can perform tests to determine if the female is pregnant.
Therefore, while the lock can increase the likelihood of pregnancy, it's not the definitive factor. Ejaculation is what truly determines whether a female dog can get pregnant.
