So how do you start training a gundog to respond to the whistle?
The first step is to train to the sit. With the dog on the lead, give a peep at the same time as moving a treat up above the dogs head.
As the dog sits, praise it up without getting it so excited that it jumps around too much. As it learns to sit, praise it slightly less each time, although sometimes it does no harm to really get a dog excited and pleased when you praise it, just keep it fun.
Then you need to go through extending the distance at which you ask for the sit. Always insist on the sit, even if it involves walking forty or fifty yards, return the dog to the point it was at when you gave the command and follow through on the request.