The Halo Collar strap has three sizes that fit dogs who are 5 months and older, 20 lbs+ (9.1 kg+), and have a neck size anywhere from 11" to 30.5" (27.9 cm to 77.5 cm).

To measure your dog's strap size, follow the instructions in the image below. At the bottom of this article, click the Collar Sizing PDF to download it, so you can print it and create the Halo Sizing Ruler.

Additional Notes

• If you'd like to see examples of what the Halo Collar looks like on different kinds of dogs, check out the article "What will the Halo Collar look like on my dog?"