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If you have a good hoof trimmer, I would totally recommend doing a corrective trimming on a calf. The younger they are, the softer their bones and cartilage is. You can make more impact from one hoof trimming at 4 months of age vs. 4 hoof trimmings of a calf over a year old. There is also much less chance of crippling a calf if corrected slightly as a young calf vs a lifetime of corrections once the bones have started to calcify.