This app is really a godsend to anyone with a puppy in its socialization phase (8 - 14 weeks) and to anyone with a noise fearful dog. You just play the pre-recorded sounds at low levels whilst doing something fun with your dog, and gradually they get used to (puppies) or get over their fear (dogs). Has the option to record your own sounds as well. So if your dog is scared of rollerblade noises, you just record that, and play it back! Used this with a litter of puppies recently and recommend to all my clients who might have need. It can also be used to proof your dog’s training against distractions, or to go get a toy when the doorbell rings!