Does a dog reproduce with internal or external fertilization?

Dogs reproduce through internal fertilization. This means that the sperm fertilizes the egg inside the female's body.

Here's why:

* Internal fertilization is characteristic of mammals, including dogs.

* The male dog's penis deposits sperm into the female dog's vagina.

* The sperm then travels through the reproductive tract, eventually reaching the egg in the fallopian tubes where fertilization occurs.

This is in contrast to external fertilization, where the sperm and egg meet outside the body, such as in fish and amphibians.