I took our puppy to training class today. The trainer mentioned that apart from chew toys, dogs should only have one toy which is kept in the owner's possession and only brought out as a reward. Is this a normal tenet of training? The trainer has a few odd notions and I'm not sure if this is one of them! I do have a tuggy toy and a ball on a rope which she can only have when I am playing with her but she also has free access to a lot of other toys. Am I being too soft?