Gelding that acts like a stud

How long ago was he gelded?   it takes awhile for the levels to come down
How old is he?  Has he been used as a stud before.?
 
If he is a crypto,   surgery will be $$$$.    If you chose not to go that route
my advice would be to rehome him.
This is also a genetic fault and should not be bred on to other foals  (colts).

He may be a crypto, and that will be expensive.  But this is a behavioral problem.  I have a stud colt that unless he cow-hocks out I have no intention of cuttin, altho he is just now gettin to act 'studdy'.  You need to achieve alpha with this horse and fast.  If you can't, someone who knows what they are doin should.
 
Not all behavior problems are fixed by geldin them, alot of people don't realise that.  You mite turn the fire down, but you ain't gonna change the basic way he acts.  He must be taught rearin is bad.  Rearin, striking out with a foreleg, biting and kicking are the ONLY reasons I 'strike' a horse, and I do.  And I back them up, make them give me space.  I never yell, or yank, or none of that nonsense, but they know I mean business.  This horse needs to be taught respect, and it takes a VERY strong willed and confident person to do that. 
 
Don't feel bad if this is outta your hands to deal with.  I have been in horses for over 30 years, been trainin for the last 6, and I am just now cuttin my teeth on a stud colt, and an EXTREMELY laid back (naturally) one at that.  They aren't easy to handle, and takes alot of work.  Whether you get him surgery or not, his behavior must be addressed.
 
Best of luck with him, and be safe.

I have a trainer that is going to put some time on him. When I get the test results back, I will hopefully find a cheaper vet. Sometimes calling around can save a lot of money.... It may not solve all of his issues, but I am hoping that it will take care of some of it.
There is no doubt that this boy needs to be taught respect and manners.
I have separated him from my herd and he is currently living in my round pen until the trainer picks him up, hopefully today.

Two of my geldings snake their necks.  As a matter of fact, Miles will snake his head and Bully stands behind him and snakes his head behind Miles' back, as if he's mocking him. []  It's kind of a dominance thing, I believe.  I know DaneHaven scolds for it but I don't mind as long as they are directing at each other and not me.

Just thought that I would give an update on my boy.....his lab results came back normal. He is not a cryptorchid or anything. He is a gelding that has some behavior issues.

He is home now after 2 weeks at the trainer, and at first was a jerk, but now that he is in with the rest of the horses he really seems to be bahaving himself. He has calmed down so much since I first got him.....

He needs to be ridden. He's pretty green or hasn't been ridden enough, but I did get to ride him at the trainer. He was a good boy.

I will keep him for now, and sell him if I'm able to after working with him.

My first horse was like this. We tested his testosterone levels and they came back normal but he would buck and when it came to mares he went crazy. We kept him seperate from any others as he would dominate over them and deffinately seperated geldings and mares. He may have been gelded late or a testicle may have not dropped. You won't know until you get the lab work back. But for now you are doing the right thing. Maybe work with him on the rearing issue or have someone else do it if you are not able to stop it. I would suggest some natural horsemanship activities to get him to respect you and your space. Another option is Depo shots. That is pretty much injecting estrogen into him. It had worked with my old horse and I occassionally will use it on my new horse just to make him not as aggressive toward jumps and act a bit calmer without the attitude of a mare. It really works well in horses. Ask your vet about it if the levels come back normal or even if they don't. It could be a good possibilty this would calm him down. Best of luck and I hope this helped!

Training will only go so far if the horse really is a chryptochid.
 
My friend's colt was born on her property when we were in our mid-30's.  We were both raised with horses and had done our fair share of horse breaking, starting when we were kids.
 
Her colt got to be really mean and aggressive by the time he was around 12 or 14 months.  She was working an obnoxious amount of overtime back then and didn't have much time to work with him, so I brought him to my place.
 
He was there a week when, out of the blue, he reared, bared his teeth and came at me striking.  Back then I was pretty limber and was already prepared for what he might do.  I was able to flip him over and get his attention for a short period of decent behaviour.
 
We knew only one testicle had dropped so, at that point, my friend called the vet.  I don't remember the details but somehow the other testicle cord was wrapped around where it shouldn't have been, way up inside and surgery wouldn't even guarantee success.  This was back in the very early 80's so I don't know how that would be treated today.
 
Had he been my colt, I would have had him euthanized because, gorgeous buckskin that he was, he was useless to himself and everyone else.  My friend took him to the auction and made the announcer give a full disclosure.  As soon as we heard that disclosure, we left and they sent her a check. 
  
I hope in today's veterinary world there is medical help for your horse that will allow him a very long and very normal life[]

Well i would say it depends on how long ago he was cut. I have seen a horse that was  not used for stud and got a mare pregnet a month after being cut. and also a horse was cut as a 9 yr old that is very much so the herd leader. He still gets "happy" around the mares.

The boy is leaving me in the am. I found a new home for him....
The gal called him the appy of her dreams. She trains mustangs for the BLM, so hopefully she can handle this boy.
My other gelding is looking rather beat up, so I'm sure he will be glad when he leaves......