out of all the gundog breed cockers tend to be the pickiest in my opinion they get bored with retrieving as there too busy wanting to graft I owned one and you got about 6 good retrieves a day out of her before she got bored -my mate has one and he is having same problems with his I own 2 springers and they would retrieve all day for me labs retrieve anything all day too --so my take on it would to make a nice rabbit skin dummy and throw it down a passage way or narrow opening and see how it goes from there if dog picks up dummy make a right fuss and see if dog comes to you -reward if it does