Q. What’s size should my dog’s collar be to ensure a good fit with Heyrex?

Heyrex has been designed to fit a range of collar sizes, and each monitor comes with a collar adaptor for larger collars. Extremely small collars may also need to use the collar adaptor to prevent the monitor falling off the collar.

Heyrex will not fit a choke chain, or any collar with a large number of studs. Also some extremely wide collars will not work with our adaptor and in these situations you may need to invest in a new or additional collar.


Attaching the Heyrex monitor to a clip collar
Attaching the Heyrex monitor to a buckle collar

Frequently Asked Questions

Here’s a place to find common questions about Heyrex. If there’s anything that you can’t find here, please Contact Us.

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Heyrex History
Why we made it & the Heyrex story.