We humans, as their guardians, need to make sure that they are safely contained so that their noses don't get them into a dangerous situation. Beagles can't go on walks or hikes off-leash. For the same reasons as above, they always need to be attached to their human when they are outside of their fenced yard. They are not the type of dog that can go hiking or camping with you and just 'hang out' by the campsite. You need to have them on a leash at all times.
Beagles are difficult to train.
This is often said, but not entirely true. They can be quite stubborn.