I recently began leasing a new horse. I've been riding him for about 10 days and he has been great. He's a gentleman on the ground listens when I'm in the saddle. Today, I tied him close to another gelding as we were tacking up. He was noisy and skittish (some pawing and a high head). When we returned, we tied them back up and he did the same thing to another gelding. This time, he reared up a bit and was acting up very rudely to this 25 year old gelding. The owner said that he was acting like a stud.
Also, a mare was outside the turn-out area and he ran over to smell her and lost all interest in me. The owner said her mare was in heat. I have a feeling that he was gelded pretty late (he's 8 now).
Is this something that time helps take care of or is there something I could do to work on it?