My parents have a new puppy and the last time they had a young dog was 25 years ago, back then I remember going with my Dad to dog training classes. They used the shake the tin of coins to stop unwanted behaviour, although mostly it was praise for good behaviour, treats, pats and talking it that high pitched voices only used for babies/ puppies. I remember doing to awards with their two labs.
They have told me they can't tell the new puppy No or use a sound to prevent unwanted behaviour. I personally use ahaha noise that I say with my dog occasionally and I will also say NO or STOP firmly also to the kids too. They say this is aversion training and I disagree. To me the aversion training is spraying water, air horn zapping / citrus collars ( also very popular back in the day.) What do you think and do?