by clicking on put to sleep after you register in an equestrienne center

If you mean put to sleep as in kill them, you can't. If you don't want your horse anymore
you can put it up for sale and wait for someone to buy, or just sell directly to safe
haven.

If you mean put to sleep as in put them to bed, foals don't have to be put to bed. Until a
certain age, they're young enough to stay with their moms. Once their old enough to board
in their own stall, you need to register first, and then there will be an option to put
them in the pasture or box.

very good answer mr/mrs Put to sleep? lol just a compliment!
HorseGal38 on Howsre plz pm me! xx