Whistle is a smart device for your pet to keep track of their activity and them. Whistle has feature like activity features, GPS features and many more features that give you the fastest and most accurate tracking nationwide. You can monitor your pet’s daily activity and rest to keep your buddy in great figure for their age, mass and breed. You can also track their progress and set custom goals for them. Whistle charge a minimal sum of money from you for their product and if you are not satisfied with their performance or your pet is not comfortable with it then you can return it.