Can a pregnant dog have puppies from multiple fathers in one litter?

Question

During heat period I had mated my bitch with a good Labrador male on the 3 dates given by the Vet. The first two matings with the male Labrador was successfull. But before 3rd mating I doubt whether my bitch has mated with a male stray dog . If yes , how will it affect my puppies ? Will all the offspring wil have some charecteristics of male stray dog or just one or two puppies ? Will semen from stray dog affect all the eggs released ? And she is getting pregnant for the second time in her life. Pet's info: Dog | Labrador Retriever | Female | unspayed | 2 years old | 30 lbs

Mallori Kaminski, BVSc · Accepted Answer

A bitch can have a litter with multiple fathers, if she was mated by more than one dog during her heat. So if Silky was mated by a Labrador and a stray dog, it is possible that some of the puppies will look like the stray dog. It just depends on how many eggs the stray dog's semen fertilized. Any that the Labrador's semen fertilized will only have the characteristics of the Labrador.

Can a pregnant dog have puppies from multiple fathers in one litter?

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