My 12 yr old gelding has had a lot of pasture time lately due to my having to care for other urgent needs. Now that I can get out to the barn and ride now and play with them, I have found that my gelding has gotten spoiled and bossy. He has no respect for personal space. He will do fine under saddle. Quite, trusting, easy to manage basically....but on the ground he is pushy, won't lead well, nippy, ect. Any one have any ideas on how best to correct this? Or maybe links to a video?