Why, and what can I do to put things right?
To sort this problem out you are going to have to go back to one of the training basics and that’s teaching the dog to obey the stop whistle the instant you blow it.
This simple lesson needs to be drummed in before you go back to doing multiple retrieves, because it is vital you are able to stop and swap directions whilst retrieving.
This exercise is a must for those who do a lot of peg shooting because at the end of the drive the dog will have to pass a number of dead birds both on the outrun, and the return.
To get the lesson across start with just two dummies, send the dog for the one you threw first and do not let it move toward, or retrieve, the other until it has returned with the one you wanted.
Build on this with more dummies as the dog progresses.