This is a mature horse at Little bramley farm horse sanctuary which has been known to be lame after being trimmed.
He has a deviated knee and fetlock which causes him to grow unlevel so by trimming him level causes lameness.
In the before video you can see he lands heavily lateral (outside) first so I trim leaving the inside (medial) heel high and heavily roll the outside and then watch us walk up again where you can see in the after video he lands a lot more level which keeps him sound.
It’s amazing how much you can learn from taking a little bit of time watching a horse move.
On a side note please like and follow little bramleys page, Ive worked for them for the past 5 years and what they do is nothing short of amazing, such an incredible place and people.