Your dog's safety is our top priority, so we designed the collar to be comfortable and safe to wear throughout all stage of life.
And Fi can grow with your puppy, too! The Fi band is interchangeable, so you can purchase additional bands ($29/each) to go from a Small to Medium or Large, for your growing pup. Here's a guide on how to Replace the Fi Band.
You can use this direct URL to purchase an Additional Band(s).