how do you teach a puppy to not bite you? My shepherd is 4 months and he's always doing it. There was a trainer who told me on the phone that I need to elevate myself from being his littermate to his leader because puppies dont nip leaders. He said that my dog does not respect me. And he said that spraying water would not work on most shepards (I've tried it, he just tries to drink from the container) and yelping would not work either. He told me to firmly grip the scruff and shake it, and I did it but he bite me even more so he said I was not being firm enough. So he came to my house to show me how, he did it only once and my puppy never bite him again it was amazing. I thought I got the hang of it but now he's gone and I'm left with this little monster again. I tried to do what he showed me but it would not work. I don't want him to come back again because h'e's so expensive so if anyone knows how to do it.