I am training my 9 month ESS pup and has developed a fault. If I throw a dummy out he will retrieve it faultlessly but if I throw another one out when he is coming back to me; he will then drop the one he is retrieving and stop and look at me. He does not go to retrieve the one I have thrown to distract him, but stopping and dropping is a fault. He even does it if I drop a dummy out of my hands when he is coming back to me.
Any tips please ?