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Horses can lay down. They can not lay down for a long time because the weight of their body is too much for their lungs and organs (like a whale on a beach out of water). If they lay down a long time they can not breathe.
The owner must trim the feet because hooves keep growing all the time like your fingernails. If the horse is in a barn or pasture with soft ground the feet get too long and can start to crack - lots of pain and infection, sometimes can kill the horse because it can't walk. Wild horses run free over rough ground and rocks. It wears down their feet. Horses that go on paved streets a lot wear shoes so their feet do not wear down too much.
Horses do help each other scratch their backs sometimes by chewing with their teeth but don't really do much grooming for cleaning purposes. They have short coats. The mane and tail of a wild horse can be very tangled and dirty but it is not a problem for the horse running free. In a small space like a barn a tangled up mane or tail is a place for parasites to hide and will cause problems for the horse so the owner must groom it and keep it clean. I had horses for years when I was younger.
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