Even though he acts like a big puppy(which is a good thing), don't ever treat him like one. He does what you want him to do every time and if he doesn't want to you work with him till he does. Right now you are his "herd" and you don't want him to be the dominant one. A horse who doesn't know his place gets confused and ends up either dangerous or insecure. You will thoroughly enjoy owning a horse. They are the best animals on the planet. Just work with him daily on a lead line at the least and make sure he does what you ask him to do. I think you probably just found the second love of your life!