I have a collie cross which i have used for tracking and following up, she is now 24 years old, a bit slow, limited eye sight, almost totaly deaf but still gets the job done. i also have a lab that is 3years old, he shows potential but i doubt he will ever be as "straight forward" as the old collie cross. amazing intelegence and a great nose. as the saying goes : "the old ones are the best"