I had such a gelding. he was fine when we got him
as a 4 year old, and then started acting more and more stud like. Finally got in
with a mare and had his way with her...well, she was willing. He was horrible to
have around. He would display more stallion like behavior than most stallions.
Snot and talk, prance and drop any time he got near any new horse. We took him
to the vet, they did a blood test, and found a high amount of testosterone in
his system. Some where between gelding and stallion levels. We were told by his
breeder, he had a normal gelding, both testicles etc. I was not comfortable with
the cut them open and dig around surgery options to go see if he had something
in there, but found a procedure where they ran a laparoscope up into him and
with the little camera, found the retained testicle. I guess they were wrong
about him having two when they gelded him. Anyway, it was about the size of a
grapefruit, up near his abdomen. The next day, he was a normal gelding in
attitude. He walked into the vet barn acting very rank stallion like, and left
as quiet as can be. And yes, I was told had they not removed it, that it could
have caused him more medical problems.
It might be worth at least the blood test to check
testosterone levels if the gelding is acting that stallion like.