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deanne These boots seemed a tad big for my 15.3 TB but at least they well and truelly covered the knee. The top velcro just barely reached to secure on. My big problem with these is the bottom velcro straps, i had to literally wrap it around the leg twice, im sure the length was made for a elephant leg, the biggest issue is the sticky part of the velcro is right on the end.I had to cut it of and sew my own on it and now it fit great.Love the magnetic application, they work well.