You have to teach him that he wants to come to you. Beagles respond well to treats, but soon learn that any action without a treat isn't worth the trouble. A big part of getting a eagle to come to you is your bond with him. We have a 5 year old names Zeke that looked a lot like yours when we got him. Tall and skinny, but very athletic. We adopted him at about 1 year and we were his 3rd home. He had, and still does, have separation issues. By building a tight bond with him, though I have capitalized on his insecurity so that he he gets nervous when he can't locate me. When he gets out of sight and isn't on a scent he will look for me. All I have to do is whistle and he will zoom back like a lost dog. Of course when on a scent, all bets are off. Then you have to either shoot the game or intercept him on the trail and physically pull him off of it if you need to.