We have a (mostly) adorable 9 week old Border Terrier. She is massively intelligent - almost always wees and poos in the garden, can follow simple commands, enjoys ‘foraging’ for food in a rolled towel. Loves her toys, antler etc. But she bites me, really hard, and attacks my clothes, ankles and - particularly excruciating - the upper surface of my foot. I try to be calm and to offer alternative things to chew, but she’s frighteningly determined to sink her teeth into my quite elderly and tender flesh. I do all the ‘right’ things, freeze and turn my back, remove myself for time out, but she just starts all over again and doesn’t bloody let go. Any wise words?