While usually classified as a "low shedder" due to the very short coat...all dogs shed. It is a normal process for each hair follicle to fall out after it grows to a certain length and then is replaced by another.
However, it is true that some dogs shed much lighter than other. When it comes to knowing this about Beagles, this breed is a light shedder. There are times when the shed may be heavier. This will happen to a more moderate degree if the dog lives in an area that experiences extreme seasonal temperature changes.
Also, females may "blow the coat" after a heat cycle due to hormonal changes and many females lose some coat after giving birth.