Fi Series 3 BioThane by Mutt Pack
BioThane Color Options by Mutt Pack Outfitters
Fi Series 3 BioThane by Mutt Pack
BioThane Color Options by Mutt Pack Outfitters

BioThane® Fi Dog Collar Band *Series 3*

Regular price $74.99

BioThane® Meets the Fi Smart Dog Activity Tracker

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!

The "Over Collar" version of our Fi collar is designed to reduce stress on the Fi unit itself since the unit sits on top of the collar as opposed to being built in-line with it. It is also available in reflective in a separate listing!

This is compatible with the Series 3 only. For Series 2 compatible collars please view our other listings.

Please note, this collar does not include the actual Fi  Series 3 Tracker. This must be purchased at: 

BioThane® is hands down the perfect material for a Fi collar for many reasons. It is extremely easy to clean; warm water and a mild detergent are all you need to remove mud and dirt. It's also fully waterproof and doesn't absorb odor like nylon collars do. The durability and longevity of the material are huge benefits for adventure-loving pups! All of our Fi collars use 1” webbing.

How do I pick my colors?

We have included a reference picture in the slides to show what each part refers to so you can make sure you select the right colors for the right parts. The collar color selection designates the main color. The strap keeper and accent color selection designates the color for the strap keeper and the Fi link holders. For example, in the featured picture, the parts are as follows:

Collar Color: Neon Yellow

Strap Keeper and Accent Color: Black

What hardware do you use?

Our Fi Dog Collar Bands are all made with your choice of top quality hardware options.

Our gold hardware option features 100% solid brass hardware. Brass is an amazing hardware choice for dog products because it is fully rustproof and holds up well in terms of durability. After extended use (especially in water) the finish may patina over time so if you prefer hardware that will keep it's sheen, we recommend choosing our silver option.

Our silver hardware option features a combination of stainless steel and nickel plated brass so you never have to worry about rust. The hardware we use is designed to be very strong and durable.

We also offer the option to add grommets to the adjustment holes to add additional reinforcement if your dog is a strong puller. They can add a little style to your gear too!

How do I choose which size collar to get my dog?

For best fit, measure your pup's neck and choose the size where your measurement fits roughly in the middle. If you prefer less overhang, choose a size where your measurement is towards the high end of the collar's range. For example, a 15" neck would fit in the Medium range best and a 22" neck would fit the XL range best. The sizes for our Fi collars are slightly different from our so please keep that in mind.

It is also important to note that this collar uses heavy-duty materials (both the webbing and hardware) and is not recommended for small dogs, or dogs that need a lightweight collar as this adds significant weight. It is up to the customer to decide if this style of collar is appropriate for their dog, though we typically recommend these collars for dogs 35lbs and up.

Available Sizes:

Medium: 13-16 inches

Medium/Large: 15-18 inches

Large: 17-20 inches

Large/XL: 19-22 inches

XL: 21-24 inches

XL/XXL: 23-26 inches

XXL: 25-28 inches

(Due to customer request, we have increased the overall adjustment of each size, making them one inch tighter as of April 5th, 2022. This is not reflected in the sizes listed as these sizes are designed so the tail of the adjustment strap does not overlap or block the Fi unit visually. The extra inch allows the collar tighten more than the sizes listed to help account for customer error when measuring and to give more flexibility for growing pups. For example, a large which is ideally suited for 17-20 inch neck size, will now measure 16-20 inches in adjustment range.)

Please be sure to double check your pup's collar size!  Ensuring size is the responsibility of the buyer and we do not accept returns or exchanges on products where the wrong size is selected.  It's always best to measure twice just to be sure!

Swapping your Fi Band:

If you need assistance swapping your Fi Band, please refer to the following link:

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 136 reviews
Colleen G
Amazing quality

I love this collar. I purchased it for my puppy, and loved it so much, that I bought it 2 more times as my 20 lb puppy matured into an 85 lb adult. I highly recommend.


Durable and well-made collar

Richard Osborne
First Muttpack collar

Received the collar in a well packaged box. Nicely made, with FI series 3 connectors. Material is pliable enough to be comfortable for the dog, yet appear strong enough to never be questioned. Pricey, but worth it.