| Go to Premier.com and look at the bark collars that use a burst of citronella spray rather than a shock. Hounds can be pretty tough and they are inclined to bark anyway. The citronella just has an unpleasant smell and makes a hissing noise that distracts the dog. While you are on the site, look for some interactive toys like Buster Cubes or Kongs. The puppy has to manipulate these to get to the goodies inside, and it gives him something else to do with his mouth! I have also heard of people hiding the puppy's food all over the house so he can use his nose and "hunt down" his prey. I like these methods because they work with the puppy's instincts instead of trying to turn them off.
You may even need to consider adopting a second pup or older dog, since Beagles are a very social breed and are often hunted in packs.
Let the neighbors know what you are doing, and ask them to tell you which days he barks less so you know what works best. They hopefully will be more understanding when they realize you are trying to fix the problem. | 
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