Message "This dog unit has been worn by a dog already in your list" for the Astro and Alpha

The Astro 220 and Astro 320 systems will allow pairing of up to 10 collars into the handheld and the Alpha 100, Astro 430 and Astro 900 systems allows pairing of up to 20 collars or contacts.

When pairing multiple collars or pair a collar that is already in the dog list, the device may prompt the message, “This dog unit has been worn by a dog already in your list". If this message is displayed, it means that the collar is already in the dog list.

When pairing multiple collars to the handheld, pair one collar at a time. Once the collar is paired to the handheld, power it off. The pairing process can then be repeated for the next collar.

For information on how to pair a collar to an Astro and Alpha handheld, see the related content at the bottom of the page.