Hi I have just rescued a young dog who has apparently been trained with a whistle. One long blast to get his attention and three short blasts to come. It would seem good to continue this training, but indoors any blast of the whistle seems to make him rush to me (not a bad thing, but it would be nice to try and reinforce the original training with one long blast simply getting his attention). Are there any good resources out there for this type of training? Does the 'Total Recall' book cover different whistles for different commands? Thank you for any advice!