The plastic whistle stymied me.
No matter how I blew into it, it wouldn't make a sound.
Still no sound.
Learning to use the sheepdog whistle is like learning to whistle. You just have to experiment.
Whistle in mouth, I walked around the house, trying different things - blowing light puffs of air, repositioning the whistle.
A squeak came out. I tried to duplicate it.
The morning wore on. I got more squeaks. Then tones.
You can go back to your childhood. All that you need is a sheepdog whistle.