Free images results:
 

Horse 4 pictures, stock photos and images

 
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Horse Royalty Free Stock Photos
Author: Chrisharvey
Horse Royalty Free Stock Photography
Author: Caramaria
Horse Head Royalty Free Stock Photos
Author: Tmcnem
Horse 4 Stock Photography
Author: Cavallo
Horse Royalty Free Stock Photos
Author: Caramaria
Raoul1 Royalty Free Stock Photos
Author: Moonlight1
Week Old Royalty Free Stock Images
Author: Hixnhix
Lunch Time Stock Images
Author: Bigo
Twisted Stock Photo
Author: Cookiejar
A pony Stock Photo
Author: Hope72
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Sea Horse Royalty Free Stock Image
Author: Yodke67
Horse Fly Royalty Free Stock Image
Author: Tolola
Sea Horse Stock Photo
Author: Yodke67