What do they are used for male dogs and female dogs?

Please clarify your question. What do you mean by "they"? Are you referring to specific items or concepts?

For example, are you asking about:

* Reproductive organs? Male dogs have testicles and a penis, while female dogs have ovaries, a uterus, and a vulva.

* Grooming tools? Different grooming tools might be used for male and female dogs depending on their coat type and breed.

* Medical treatments? Some medical treatments might be specific to male or female dogs, such as spaying or neutering.

Please provide more context so I can understand your question and give you a helpful answer.