Horn phenotype "H" (rams).
Large, coiled horns.
Genotype is pp, or p'p or p'p' if the ram carries the horned ewe gene.

These are the typical full horns observed on the majority of Shetland rams. These horns are ridged, and have thick, wide bases.    
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Photos courtesy of Gail Former, Underhill Farm, Spencer, IN
"Round" profile horns.
"D" profile horns.
Spotted rams photo courtesy of Mary Ellen Kelly, Missouri.