One of my original stock shetlands spent last summer trying to worry me stupid she was lame, on inspection I found pockets and trimmed, she got worse, I did research on here and decided leaving it was my best plan, we had a look when they were sheared and the outsides were a bit long / growing under the soft bit, but she walks fine and chases a bucket, not trimming her now had saved her from being culled this year at least (cracking twins helped her case)