Here are a few of many of Picasso’s horse drawings & paintings. There are many great Picasso horse drawings from 1936 & 1937 when he was doing studies for Guernica. The bottom right piece Tete de Cheva was actually stolen from a Swiss museum in 2008. Picasso seems to be very popular with art stealing criminal crowd. Darn Peirce Brosnan - making stealing artwork seem so appealing (if you’ve ever seen The Thomas Crown Affair).
Tea’s Caballo Graphic Tee and Picasso’s Horse Study V
The Online Picasso Project is a great place to explore some of Picasso’s lesser known works and see many of his studies.
p.s. one last great horse drawing that I can only find here.