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Originally Posted by TresCutePiggies  I think those are the extra attachments that usually come with Flexi leads. I haven't bought a Flexi in a long time since I found out how dangerous they can be, so I could be remembering wrong too!  I never used it since I believe it's something that goes around the dog's neck in case the collar breaks and we always attached to a harness...I could be way off here. 
ETA: Ah ha! I found the instructions, and they refer to it as a safety collar! Extendable dog leads, retractable leash, leash training supplies at flexiusa.
I should add that a coupler typically has a d-ring at the "point" on the V shape which attaches to the leash and each end of the V shape has a clip to attach to the dog. My favorite coupler is by Wacky Walkr. |
The safety collar, that's what it looks like to me also.
I bought a coupler and tried using it, honestly though, it's easier for me to walk them with out a coupler than with one. I walk up to 4 dogs on separate leads and rarely have a problem with twisted leads.