
Wonderful - I have a non retrieving retriever :-) He can retrieve but he prefers not to - he will carry something of his choice sometimes when we are out on a walk - unfortunately it's usually a rock he will find and carry :-O and he will sometimes retrieve a toy, once, if it is thrown but a dumbell has never been an item he will retrieve.
You have done really well to get him to finally pick it up from a surface - I clicker train as well and think it is a great way to train :-) Well done your lad :-)