Make sure you have a good fence. They are escape artists. They have big hearts and love people, but with that if left alone too long or ignored they will wail and cry and do everything to escape to go find you. That of course goes with just about any sporting dog, but Beagles are hounds so know they can be incredibly loud when put in that situation. Untrained and off leash in the woods, they will track and chase anything that runs. Including your neighbor's cats given the chance.
"Onward up many a frightening creek, though your arms may get sore and your sneakers may leak. Oh! The places you'll go!" ~ Dr. Seuss