Have your dog repeatedly do a trick until a message appears. Name the trick to have the dog do the trick every so often. Keep teaching it the trick until it performs it the first time you call it. Note: Dogs can only do so much training in one day. For more training, wait for the next day.
When teaching your dog to fetch, every time it brings back the item from tapping the screen, pet it until sparkles appear. Then, take the item and throw it over again. After repeating this a number of times, your dog will bring back the item automatically and make the contest easier.