if you haven't already got the one without the other, here's the lead and coupler together. essentially, you're getting three leads.
this handy deal includes a lead can be used singularly by being attached directly to a collar, or easily attached to the coupler, which attaches to two collars around both your dogs' necks.
pictured: mixed; red sand and black
//please note, colours and sizes may vary slightly, as everything is made by hand.