Can you take him on a leash instead of just letting him out loose? I am always out with my 3 and I tell them to go pee. They know when it is play time and when it is pee time. Try to give him some hunting type activities during the day to help with that natural instinct. I do "kibble search" with my beags, I toss kibble into the yard and let them find it. You can also hide something like a sock or glove with your scent and tell him to "seek". They do tend to settle down once they have a schedule established. One of my beags used to be a hunter and she has chilled out big time over the years.