My 14 week old collie cross puppy is constantly hounding my 2 year old dog in the house. She makes him play when he clearly doesn't want to and it ends up with him snapping and growling. I thought letting this happen once would teach her but it hasn't and I won't let her annoy him any more. I can't keep her behind the puppy gate because one of my older dogs is afraid of it when she climbs on it and goes crazy. I've started putting her in her crate when she annoys him but that means she is spending far too much time in the crate everyday. Any ideas?