Dogs cannot fertilize a woman because the genetic makeup of humans and dogs is too different. The vastly different number of chromosomes alone makes pregnancy impossible. This isn't even possible with chimpanzees.
You can imagine the genetic material like building instructions. So imagine if you combined instructions for building a tractor with instructions for a glider.
The result probably wouldn't be a flying tractor, but just a pile of metal that can't fly or drive. This is exactly what a half-human/half-dog would be like.
There have been several stories reported in the past of a woman giving birth to multiple puppies. But these myths have long since been refuted. [1]
To clear up any doubts, let's take a closer look at the scientific reasoning behind this. And don't worry. Everything at a simple level.
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Scientific explanation
Every living being has a genetic makeup. So not just people and dogs, but also plants. You can imagine the genetic material like a book that has many pages.
The sides are the chromosomes. Under the microscope you will notice that one side of paper has a lot of fibers. In our example, these fibers are the DNA.
Or to put it another way: Our genetic makeup consists of chromosomes and our chromosomes consist of DNA. Basically, DNA is nothing more than information.
For example, this information explains why people have 2 legs and 2 hands. She also explains why dogs have 4 legs, fur and a tail.
As a rule of thumb, you can remember: the more similar the genetic makeup of two living beings, the more likely they are to be able to reproduce. And vice versa.
This very point also explains why a dog cannot impregnate a woman. The genetic makeup of dogs and humans is simply too different. Here is the comparison:
Part of the genetic makeupHumanDog Chromosome pairs2339Individual chromosomes4678Number of genes20,000 – 25,000~ 19,000[2, 3]
If the chromosomes differed by just a few pairs, pregnancy might be possible. However, the offspring would most likely be infertile.
This is because for successful reproduction, the chromosomes of both creatures have to split and redistribute. This becomes difficult with odd numbers.
This is exactly the case with a mule, for example, which is created from a horse and a donkey. Mules are infertile because they have an odd number of chromosomes, 63.
The chromosome numbers of dogs and humans are very different. For fertilization to be successful, both would have to have a comparable number of chromosomes. It is therefore proven impossible that a dog can impregnate a woman.
Video evidence: Here a woman gives birth to a puppy
https://youtu.be/aJyiunpA9p8
Mind game
Assuming the chromosome numbers of dogs and humans were the same, could a dog impregnate a woman? The answer is a resounding “yes”.
Researchers suspect that fertilization would then be possible. Whether the offspring would actually be fertile and capable of surviving is another matter. [4]
Because this is exactly where genes come into play. You can think of genes like a timed light switch. They turn on and off automatically. You can't change that.
The problem? Dogs and humans have almost the same number of genes, but they switch on and off at different times.
The result? There would probably not be a harmonious development, but a wild, uncoordinated circus. Development errors would be almost inevitable.
It would be unrealistic for a half-human/half-dog to combine the advantages of humans and dogs. Rather, the advantages would be canceled out by mutations.
An incapable creature with visual similarities to humans and dogs would be more likely. It probably wouldn't survive for more than a few days.
Even with a similar number of chromosomes, dogs and humans would not be able to reproduce successfully. In this scenario, a dog could impregnate a woman, but the large genetic differences would severely limit development.
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