On Feb. 2nd, I unlocked the Jack Russell Terrier! People say to wear a lucky collar and use a clover clock to find the book used to unlock them with. And it worked!!! It took me DOZENS and DOZENS of walks. My suggestions on finding it would be to use your oldest dog and take it for a long walk. Be sure to have a lot of trainer points. After going over every "?" mark on the map, draw the path to the park, then right back to your house. On your way back, do not go over ANY "?"s. Go on your walk. When you finally reach the park, change your dog's collar, bow or hat. It will say "Saving...Do not turn the power off". Then, (if you didn't find the book) after that, you turn the power off. When you turn it back on, your data would have saved, but you could go for another walk without having to wait 25 minutes! Keep on doing this until you find the book.