Fi can grow with your puppy! We designed the Fi Collar to be comfortable and safe to wear throughout all stages of life.
For a growing puppy, you first need to purchase a Fi Collar Kit. See: What's Included With a Fi Collar "Kit" Purchase? For puppies, we recommend buying a size Small or Medium kit to get started. This size choice varies depending on the growth stage your puppy is in when you bring them home after adoption, rescue, etc.
The Fi Band you receive in your collar kit is interchangeable. Therefore, you can purchase additional bands as your puppy grows ($29/each). Our Fi Bands range from a size Small to XL (extra large). Click here to purchase additional bands through our online shop. Once you receive your bands, here is a guide on how to Replace the Fi Band.
To decide what size band to purchase when your puppy is done growing, you can use Fi's sizing guide. See: What Size Fi Collar Should I Order? We suggest choosing a size based on the breed recommendation that matches your dog's breed. The breed listed in the sizing guide is based on the breeds average full grown size.
Fi growing with Jax: