1.5 Biothane® Martingale Fi Dog Collar Band
BioThane Color Options by Mutt Pack Outfitters
1.5 Biothane® Martingale Fi Dog Collar Band
1.5 Biothane® Martingale Fi Dog Collar Band
BioThane Color Options by Mutt Pack Outfitters
1.5 Biothane® Martingale Fi Dog Collar Band

1.5 Biothane® Martingale Fi Dog Collar Band

Regular price $89.99

1.5" BioThane® Martingale Fi Dog Collar Band (Non-adjustable)

When Fi launched their dog activity tracker, they brought unmatched technology to the dog community. The Fi Tracker is perfect for active pups, and we made a collar that pairs perfectly with it. You can choose from a wide variety of colors to build your pup a unique collar that showcases their personality. Every Fi Dog Collar Band comes equipped with genuine Fi end-links. All you have to do is attach your tracker and you're ready to go!

Please note, this collar does not include the actual Fi Smart Dog Activity Tracker. This must be purchased at:  https://tryfi.com 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:


This collar has the Fi unit sitting on the exterior of the collar, reducing the stress on the unit. To charge your unit, we recommend leaving the unit attached to the collar and slipping it into the charging dock. This helps reduce unnecessary wear and tear.


Choosing Colors:

The main color refers to the 1.5" part of the collar and the accent color refers to the 1" parts of the collar.


Collar Sizing Guide:

Our martingales have a chain range of 3 inches. At the loosest, the collar should be able to slide over your pup's head and at it's tightest it should fit snugly. Martingales are not for every dog and proper use of the collar is the responsibility of the owner.  

To measure your pup for a non-adjustable martingale, we recommend using a fabric measuring tape and measuring around your dogs neck where the collar normally sits and subtracting 1" to get the low number in the range. For example, for a dog with a 15" neck the typical appropriate range is 14"-17." This sizing allows room to tighten and pull snug while being loose enough to slide over the dog's head. It is important to note that fit is a matter of personal preference and can vary by dog. It is the buyer's responsibility to determine optimal fit for their particular dog. We are not responsible for measurement errors on the buyer's end and do not accept returns as this is a custom item.

This is a heavy collar and not recommended for dogs under 40lbs.


Product Notes:

As with any metal chain, there is the possibility of corrosion that can rub off onto a dog's fur and cause discoloration. This is particularly true in climates that are naturally corrosive such as beaches or areas with high humidity. This can become visible on white dogs, or dogs with very light fur. Good chain maintenance can help prevent this from happening but some environments may not be conducive to using metal chains. Typically, brass will patina when exposed to corrosive environments and will rub off in a blue color. While our stainless steel chains are more resistant to corrosion they also can corrode. Keeping your gear clean and dry after use is important for longevity and reduce corrosion.



All custom and size-specific products such as slip collars and martingales are not available for returns unless there is a problem in construction with the product. It is the buyer's responsibility to measure their dog correctly. If you have any questions about fit, please reach out before placing an order so we can help you.


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.
  • 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.
  • Never use a martingale or slip when swimming.

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.

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 2 reviews
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!