The Shetland/Small Pony version of this collar has two size positions. The uprights to the saddle are adjustable to suit pony size and type. The uprights can be removed completely to convert the pairs collar for use as a single.
I have been told that these empathy collars fit better when used by a single pony, the uprights are removed. NB You would need to use 25mm wide traces with this product.
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