Ive have a pet staffordshire bull terrier and she will retrieve a toy , and shes had no training at all,
thing to do is,
as said in the post get a lets say a rubber ball,
go to a small lane with only one way out, roll the ball down the lane, and your dog has to come towards you with the ball, give plenty of praise on return to hand, and repeat about 3 times aday,
then maybe move to a small area not a big area as the dog will want to run around with the toy as it will think you want to play a game, dont lose you cool just go back to some lane work,
then maybe throw the ball into some co