Black 1.5" Fi Compatible Collar by Mutt Pack
Fi Band Swap Instructions
Black 1.5" Fi Compatible Collar by Mutt Pack
Fi Band Swap Instructions

1.5" Premium Fi Collar - Black *Series 2*

Regular price $49.99 Sale price $44.99

Premium Fi Compatible Collar by Mutt Pack

When Fi launched their dog activity tracker, they brought unmatched technology to the dog community. Each of our Fi Dog Collar Bands comes equipped with genuine Fi end-links. All you have to do is attach your tracker and you're ready to go! Charging with this collar is also a breeze. Simply slide the charging dock between the unit and the band and let it charge - you do not need to take the unit off for charging.

Please note, this collar does not include the actual Fi Smart Dog Activity Tracker. This must be purchased at: You can save $50 on your Fi  with code muttpack50 at checkout, or you can click this link for the discount to be applied automatically:


Product Highlights:

  • Industry leading YKK plastic buckle
  • Mil-Spec Polyester webbing for strength and durability (1.5 inch width)
  • Stainless Steel D-Ring (Black Plated)
  • Separate tag holder
  • Neoprene padding for added comfort
  • Features genuine Fi Endlinks for seamless compatibility
  • Designed to reduce stress on the unit by mounting the links on the exterior of the collar's body for improved safety and security

Available Sizes:

Medium: 15-17.5 inches

Large: 16.5-21 inches

XL: 20-28 inches

(Please note these sizes may differ slightly from our other styles of collars. Please always measure your dog's neck prior to ordering)

Swapping your Fi Band:

If you need assistance swapping your Fi Band, please refer to the image in the gallery or email us for help! You need to line up the pieces right for the end links to connect with the device. You may need to be firm when pushing it on, but you do not need to use excessive force as this will risk damaging the casing on your device. To see Fi's official instructions, follow this link to see a step by step video:


General Safety Tips:

  • Inspect your gear before each use for wear and tear that could cause safety issues.
  • Always make sure you are clipping directly to the d-ring and not the tag ring.
  • Never use a leash or collar for anything other than it’s intended purpose. Misuse of gear can lead to safety issues.
  • Never leave your dog unattended while any gear is being worn. It is also not advised to allow your dog to drag their leash behind them on the ground.
  • It is the buyer’s responsibility to determine what gear is appropriate for their dog’s size, strength, and activity level. Mutt Pack is not liable for any injuries or damage that may occur as a result of use.


Return Policy:

We want you to dig your gear as much as we do! If you don't love your order, you can return any non-custom items that are in their original packaging and have not been used or worn within the first two weeks (14 days) of delivery.

Please note, we do not allow returns for any BioThane products as these are all custom-made items and we do not allow returns on discounted or clearanced products.

For custom (all BioThane) products, please reach out if you have any questions before ordering. If you would like to preview a color palette we can assist with that to make sure your design is to your liking. It is also important to note that it is the buyer's responsibility to properly measure their dog. Please verify that you are measuring correctly for the item you are buying as we do not accept returns if the wrong size is ordered. If you have any questions about fit, please reach out before placing an order so we can help you!

International (non-U.S.) orders are also not eligible for returns.

Customer Reviews

Based on 4 reviews
Hannah Snyder
Love it

This is my second muttpack collar. I made a custom one last year for my Fi collar and loved the waterproof aspect of it. Had to get my little buddy a muttpack too and it looks great on him !! Durable and obviously amazing quality.


Super sturdy collar

Sarah Brown-Walsh
Well made

Sturdy and durable collar, really good quality as well!

Elizabeth L
Amazing Style and Function!

I loved Mutt Pack’s martingale design so much I had to get my hands on the Fi version ASAP! And it’s perfect! I love how easy it is to charge my Fi unit while still having the chunky martingale look! I also love that there’s no stress on the unit itself either! Now I can walk my girls on a style of tool I love to use and I know they’re ready for any adventure!