This horse is not well-mannered enough for you to show and you are probably going to encounter problems under saddle and in hand as spring gets closer.
First of all, is there a really good reason he is still a stallion? Does his owner have a need for a stallion?
I have owned stallions for some 45 years or more. I only have one now, an 11 year old that we use for breeding. He has AQHA points and has point earning foals here, in Europe and in the UK. He has a job and he SHOULD be a stallion. Very few horses should.
If you have a horse that is exposing himself, you need to get after him hard enough that he stops it. This is vital under saddle and in hand. DO NOT show him until you know you can keep him 'decent'.
I can get our stallion out and if he even looks toward a mare, I can say one "Ah!" and he ducks his head and watches me. He only thinks about mares when we put on his breeding halter and head toward the mare stocks. The rest of the time he acts like a gelding. That is how they HAVE to be if you are going to stay out of trouble with them.
You cannot take a stallion out and ride him or lead him around if he whinnies or squeals or acts like a stud. You just can't.
Generally speaking, if a person has to ask what to do with a stallion, they don't need one.
I'm not his owner so I'm not going to get into real detail why he's still a stallion. He's got an amazing pedigree. His original breeder races down in Indiana and this stallion is out of a top producing broodmare in the AQHA racing industry. He's never made it to the track but his foals will be. He only has a few on the ground now. But like I said, The reason's are their's, not mine.
They want to put a legitimate show record under him which is why I started this thread. He's double registered AQHA and ABRA and they plan on taking him to both types of shows.
He acts like a gelding most of the time. Like I said, he isn't hard to handle, or ride. I was just curious on the tactics some people use to make them put it away. He hasn't been in the show ring since he was a yearling so like I said, I just want to be prepared. He could be a perfect gentleman or he could act like an ass. But the way he acts around horses he doesn't know that we trail ride with, I don't imagine we'll have much of an issue.
My friend who shows pleasure has a gelding that is so relaxed in the ring that he just lets it all hang out. And he's calm as can be. That's why I was asking. No necessarily asking about how to deal with his attitude, but if it just happens to come out. My old gelding used to do it too.
My friend takes the lead and whacks it back up. Which I think is a little mean, but it works for her.