what is the possibility.....?

What is the possibility of the vet missing "one" when he/she was gelding a horse? I swear Sonny acts more of a Stallion each day.

He is REALLY vocal...each time a mare calls out for any reason (yes only the mares) he will respond back at least 5 times.

The only time he "drops" is when he is close to one of the mares that he likes.

Maybe a gelding can act like that..but I've NEVER seen or heard of one acting like that.

Very very rare is that a possibility. Not only that but if he had missed one your gelding would be trying to breed mares if he had the chance, because although he only has one testicle, he still has an active supply of testosterone meaning he will have a stallion libido. HOWEVER. One thing that MAY be possible would be that he cut to too far from the base of the testicles.The closer the cut to the horses body the less stallion like he will be. If he was cut far from his body, then he will have more stallion like tendencies.

I'm not sure where I heard that but I have found it to be true.

30% of geldings (I got this statistic from Horse & Rider Magazine, I didn't make it up) retain (noticeable) stallion like tendencies throughout their life. He may be one of those geldings.

I just think he's acting too stallionish....I mean I've been around some fairly stallion-ish geldings...but he's far worse than then. He's well behaved and everything but when a mare gets close he is vocal, usually drops, and will just be show off. He'll prance and nicker towards her.

He hasn't been in a pasture with a mare so I don't know if he'd mount her or not, but I dunno if I'll even take the chance of it

In all honesty, he could be one of those horses who was cut too far away from the body. Its not too uncommon. He could be one of those special horses that tries to breed mares even after being gelded, its not unheard of.

Some horses are gelded and the only thing it changes is their fertility.

kk maybe that's so...
In all honestly, I don't mind if he was a stallion still haha...he's so well behaved....besides for his few "look at me pretty mares" act.

It's pretty hard to just "miss a testicle" when castrating a horse. Now if he had a retained testicle your vet would have had to go in and get it if he went ahead with the castration at that time or maybe put off surgery to see if he would drop the second one, but you and he would have known about it.

It is not the distance from the testical where the cord is cut but being sure that the vas deferens is removed (commonly called the "squealer button"), but even complete castration isn't a guarantee of no studdish behavior because testosterione is still produced by other glands in the body.

Hmm, I used to know a gelding like that. You'd SWEAR he was a stallion. I don't think they missed anything. ;)

There is a slight possibility that he missed "one". It's not very high, but "it" could not have dropped. You could get a vet check.
Also, is he built like a stallion (when I think stallion, I think think neck...that's something to look for).

I worked with a gelding that was so stud-like he would mount mares and try to breed them.

A gelding at my old farm used to try and breed mares all the time and he had never bred before, and was gelded under a yearling. Its strange how some of them are.