Desktop 'Dog' Assistant

We are looking for a desktop application similar to the Microsoft Office Assistant dog, to be aimed primarily at students Once opened, the animated dog will run in the background of other programmes and offer motivation ('Keep it going') and other words of wisdom/anecdotes ('Keep smiling') sporadically, and perhaps remind the user to take a break every 30 minutes (English language). It will need to work with Windows computers, but preferably be a cross-platform programme. Budget is around $35, to be completed by Monday 28th Feb. Very happy to exchange messages to confirm details or discuss.