Yes. That determines it to be male, along with another male organ called a penis.
Sometimes the testicles do not descend down from the abdomen and are retained. You must have your Veterinarian do surgery to get them out as they can turn cancerous if left in.
Male dogs are born with testicles, but they are generally inside the abdomen. The testicles usually "drop" by coming through the inguinal canal any time after 4 weeks of age.
About 3-4% of full-term male infants are born with undescended testicles.
Only if they're Male to Female transexuals (MTF)
You cannot "grow" testicles. But if you are male you should have testicles and they will develop as you grow.
The average young male donkey will drop his testicles shortly after birth. The testicles will drop down with them 24 hours of birth.
I do not know the answer to this for sure, however, I recently took our 7 week old male pot belly pig to be neutered, and the vet cut where the testicles should be...and found none. She then cut higher and again found none what-so-ever. She stated that he was either born without both testicles (rare - less than 1% born without both testicles), or that they are in his abdomen. She then advised to keep an eye on him for another month and see if any testicles descend or if he becomes aggressive and gets that musky male odor that intact boars get. If so, we are to take him back and if no testicles have descended, then she will have to open his abdomen and look around in there to see if that is where they are. If she does not find the testicles there, then it will mean that he was born without both testicles. I would love to have a clear answer from someone "in the know" on this however. Thanks
The Male Gametes are formed in the testicles.
Only a person that was born male, and still has their natural penis and testicles can make a woman pregnant. If you were born biologically female, and surgically altered to male, then you cannot impregnate a woman.
testicles
Penis or testicles
They are testicles on male cats.
Haemaphrodite
A human male without testicles.