She is only on screen briefly but here is a slight unevenness to her gait, which she is trying to hide.
A human might not notice that something is wrong but the machine picks it up.
"Really, we want to completely replace any manual watching of animals when the cow sleeps, or she eats," says Terry Canning, co-founder and chief executive of CattleEye.
His firm's technology automatically detects early signs of lameness in cattle. It is confined to milking sheds, for now, but is already being rolled out on dairy farms, mostly in the US and UK. About 20,000 cows are currently under the system's watch.