All beagles seem like they are hungry even after they are fed. Oceangypsy had some good questions. Is your beagle chewing inappropriately? Put a drop of Tabasco sauce or hot sauce on the electrical cords, wood corners of tasty counters or wooden chairs.
"Leave it" is a good obedience command and then give them something else appropriate. My favorite...empty plastic water bottles... with supervision
Make sure the dog has plenty to keep it busy eg little treats inside a kong toy will keep the dogs attention for ages, have other toys around too, mine loves to play with plastic bottles, but I alwats keep an eye on her when she has them.