Cottage craft training roller - size

happycob

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13 March 2010
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I want to buy a cottage craft training roller for my 15hh lightweight cob. They come in small or large, but i can't find any web sites even cottage crafts own which gives actual size.
My cob is not very deep through his girth so don't know whether a small will be too small or large too big.
Has anyone got one of these and could give me any idea on size.
 
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