For the male dog, you can use terms like:
* Penis
* Scrotum (the pouch holding the testicles)
For the female dog, you can use terms like:
* Vulva (the external opening of the reproductive tract)
* Vagina (the internal part of the reproductive tract)
Using these terms is accurate and avoids any ambiguity. It's important to use appropriate language when talking about a dog's anatomy, just like you would with any other animal or human.