All dogs shed. They have to, just like we have hair fall out, so do they. Now, summer and winter coat sheds are probably what you are talking about.
There are a few breeds that dont shed like that, most mentioned already. Boykins are in that mix. I am not sure if they fall into the hypo-allergenic class, but i did have two families with members who are allergic to dogs buy pups from me, and they had no issues. They did the sniff test and all sorts of things and it worked out for them. Some Boykins have more Chessie in them and may have different results.