There are many reasons why horses might need shoes. There’s pretty much only one reason why cows don’t.
I am travelling through the US right now and just learned about
Why does a horse need shoes? - Equestrian Surfaces Ltd
This subreddit's title says it all : r/DiWHY
Do Horses Need To Wear Shoes? (Videos & Resources)
Country Ayre Farms, LLC
The Importance Of Hoof Trimming For Cows - The Open Sanctuary Project
Visiting the Gentle Barn (Santa Clarita, California)
Horses & Earthquakes Its a California thing Most people don't
Cattle - Wikipedia
Cutting (sport) - Wikipedia
Why Do Horses Need Shoes But Not Cows? - Christophe Garon
HORSE SHOE - リング
Do cows wear shoes on their hoofs like horses? Is there such a
Helping Miniature Horses and Dwarfs with Limb Deformities
Do cows wear shoes on their hoofs like horses? Is there such a thing as a cowshoe? - Quora