We now have a 14 mo old colt (to be gelded ASAP) that is extremely aggressive. To halter him consist of biting and rearing. In cleaning his pen I carry a crop for protection. He will come directly at you whipping him to stop his attacks, which he will go right thru with a full rear up and will come at you with full blown bites. I now carry a buggy whip for protection when in his pen to clean. He was my neighbor’s mini and born on her property. He was only with his dam who was mild and did not discipline him. The neighbor only feed him with very little contact. His sire was also an even temp mini. I know a great portion of his issue besides being 14 mo old colt is he has never had boundary set or ever disciplined and now that he is in a new home is trying to see how far he can push. I am hoping after he has been gelded a month or so and most hormones are in check I can put him in with my 38 inch gelding who will hopefully teach him manners. Since he is only 14 mo old will gelding him resolve the aggressive issues? How soon after gelding him would you put him in with a dominate gelding? If we had not taken him he would have been possibly put down and/or sent to slaughter. He is very aggressive and dangerous. He has bitten several people at the prior owners property. If gelding does not resolve his issue putting him down is still a possibility, as I could not put an animal like this back in the system. Please bear in mind I have taken in many colts which have all been gelded and I have never had one at such a young age be so aggressive. I am hoping the gelding will resolve much of the issues or I may have to consider the above alternative. Any and all advise is appreciated.