There are three parts of a male dog’s genital area we’ll look at: the testes, the penis, and the genital tract. Testes The testes, or testicles, are the parts of a dog’s genital area that produce testosterone and sperm. They are undescended when a dog is first born but typical...
Fetal Leydig cells then secrete androgens that induce differentiation of the mesonephric (or Wolffian) duct into the epididymis and ductus deferens and some of the accessory sex glands and of the indifferent external genitalia into a penis and in most eutherians, a scrotum. The size and ...