Expansive Customization\n\n Fine-tune over 500 individual settings on the PC version of Modern Warfare II, from keybindings and the ability to play on a controller, to graphics, audio, and interface sliders and toggles.

Start by adding small stretches of running into your walks. Then, on each subsequent walk, gradually increase the portion of your time spent running and decrease the portion spent walking. After several weeks, your dog will have adapted to running long distances.