Report Puppy Nipping Other Dogs in General Border Collie Discussion Posted October 1, 2016 She just started doing it, for one day. How long is it supposed to take? I've asked this question numerous times and have yet to receive a response. People just keep saying 'if it's still happening, what they're doing isn't working'. Are 4 month old puppies supposed to learn things in one day and if they don't then it's failing?