Ensuring your dog's Fi Collar fits correctly is essential for comfort and effective functionality.
If you have an existing collar, lay it flat and measure its length in centimetres. At its correct size, the collar should allow you to fit two fingers between it and your dog's neck.
No collar yet? No problem. Use a cloth tape measure to loosely measure around your dog's neck where the collar would sit. Add 2.5 to 7 cm to this measurement to ensure the collar isn't too tight.
The quickest way to find your size is by your dog's weight. Once you have that, check the chart below to confirm the best fit.
Series 3+ Collar Size Chart
Match your dog's weight to a band size, then confirm the fit with the neck length.
| Collar Size | Dog Weight | Collar Length | Collar Width | Suggested Breeds |
|---|---|---|---|---|
| Extra Small | Under 4.5 kg | 24.5 to 27.9 cm | 1.9 cm | Dachshund (miniature), Maltese, Pomeranian, Toy Poodle, Yorkshire Terrier, etc. |
| Small | 4.5 to 8.5 kg | 26.67 to 33 cm | 1.9 cm | Boston Terrier, Cairn Terrier, Cavalier King Charles, Dachshund, French Bulldog, Jack Russell Terrier, Mini Aussie, Pug, etc. |
| Medium | 9 to 17.5 kg | 31.75 to 41.9 cm | 2.5 cm | Aussie, Beagle, Border Collie, Corgi, English Bulldog, etc. |
| Large | 18 to 42.5 kg | 39.4 to 55.8 cm | 2.5 cm | Boxer, Doberman, German Shepherd, Golden Retriever, Labrador Retriever, Pit Bull, Siberian Husky, Standard Poodle, etc. |
| Extra Large | 43 kg and up | 50.8 to 78.7 cm | 2.5 cm | Bloodhound, Great Dane, Great Pyrenees, Mastiff, Newfoundland, Rottweiler, etc. |
Frequently Asked Questions
What size collar should I get for my growing puppy?
Consider starting with an Extra Small, Small, or Medium Fi Collar, depending on your puppy's current size. As your dog grows, you can purchase additional collar bands to accommodate their changing size.
The Fi Collar Band you receive in your collar box is interchangeable, but limited to its series. To add more, you can purchase additional collar bands for the series you need through our online shop.
Can a Fi Series Collar be used on pets other than dogs?
Since we have designed and tested Fi specifically for dogs, our Fi Series product isn't optimised for cats, horses, or any other pet at this time. We do not recommend using a Fi Series product to track your cat or horse, as we don't expect a comfortable fit or optimal performance.
If you have a cat, we recommend our Fi Mini product instead.
How do I know my dog's Fi Collar is fitting correctly?
Once the Fi Collar is fastened, you should be able to slide two fingers under it comfortably. The collar should be snug but not tight, and it shouldn't be able to slip off your dog's head. This will indicate that your collar is fitting both comfortably and securely.
Is my replacement collar band the correct size?
The Fi Collar Band is measured differently from a fully assembled collar. To confirm the correct sizing:
Shorten the spare Fi Band to its shortest setting. If your collar band still has a Fi Device attached, follow the steps for removing your Fi Device first.
Lay the collar flat and measure the length without the device. The spare collar band lengths should be as follows:
Series 3+ Fi Collar Bands:
- Extra Small: 19.68 cm
- Small: 22.22 cm
- Medium: 27.30 cm
- Large: 34.92 cm
- Extra Large: 46.35 cm
Note: The buckle for sizes Extra Small to Medium is plastic. The buckle for Large & Extra Large is metal.