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  Intent: . . . transfer a ring from the loop of one side over to be alongside the ring on the loop of the other side . . .

An old transfer puzzle design with a new look !
. . . . . The original design name from the past is called The Ox Yoke puzzle . Other names on the web are: Wedding Vows -- Puzzletts Amigos -- Puzzletts Wicky -- Bridge The Gap -- Loop Puzzle -- Sleeper Stopper . . . . .
Although its simplicity might seem obvious, it'll make your nerves start waggin' . You'll have a howlin' good time biting at the bit trying to unleash its hidden mystery . This little   flea-hounder   is nothing to bark at .

This is the focus point of solving the puzzle.
The knot's loop is pulled from the front to lengthen it for the passage of the right-hand ring.

Slide the ring within the knot's spacial perimeter of the
'Limbo Zone' .

From the front, grasp the two inner leading elements of the two loops, that are within the 'Limbo' zone . . . . .
. . . . . and pull the knot loop through the backside . . . . .

. . . . . . out to the front
. . . . . and pull enough on the knot as to lengthen it like before, and pass the ring through both loops.

. . . . . to the left-hand side

Pull the knot's two leading cord elements from the back, so as to shorten the front knot as it goes towards the dog's mouth . . . . .

. . . . . and out the back again

. . . . . back to the 'Limbo' zone
. . . . . and out to where both rings are now united on the same loop.
Readjust both loops to be of equal length -- for aesthetic purposes.