According to this website: "The domesticated horse existed in Iberia even before the Neolithic period."
https://lusitano-interagro.com/history/
https://lusitano-interagro.com/history/
Library of Atlantis
bcsp28_pp25-42.pdf
On the Magdalenian site of El Juyo
Library of Atlantis
j_jas_2006_12_009_b6d5f6af844f1b530a8d81c96aa0c426_Anna’s_Archive.pdf
Another study that suggests the possibility of an independent horse domestication event in Iberia
Had to clear out some of the open tabs on my phone so i just linked everything that looked interesting for future reference