Why do cows go lame? Lameness in dairy cows is caused by infectious lesions (digital dermatitis) or noninfectious (sole ulcers, toe ulcers, white line disease) lesions. Digital dermatitis (DD), or hairy warts, is contagious, and an infected cow develops a painful lesion that affects her mobility, thus leading to lameness. On the other hand, noninfectious lesions are the result of trauma inside the foot, which is aggravated by physiological or environmental conditions.
Read more on https://www.progressivedairy.com/topics/herd-health/why-cows-go-lame-and-what-to-do-about-it