Sorry to come in late on this thread, but have only just joined the forum and wondered if anyone else had experienced quite aggressive reactions to "No", or even just walking away? Our 13 week old cocker is a nightmare at the minute. "Yelping" when he bites just makes him crave our fingers/wrists hands even more! I know this is as a result of the pain he's in from teething and is normal behaviour, but he's started growling at me when it happens and seems to be actively trying to bite me. Am I just being paranoid as this is our first puppy? Has anyone else experienced this?!