You may be interested to learn:
"...Hunters need a medical certificate obtainable from special clinics ( Centros de Reconocimento Médico para Conductores y Armas todas las Categorías), a firearms permit ( permiso de armas) and third party insurance. Guns must be broken and bagged when transported on public land and they may not be used within 500m (1,600ft) of a house or in any urban zone (often ignored)..." see link:

http://www.justlanded.com/english/Spain/Articles/Travel-Leisure/Hunting-in-Spain

and also found in

http://www.multibriefs.com/briefs/exclusive/hunting_in_spain_what_are_the_rules.html#.Uui_KLRwbIW

In the Gencat site there is also this:

"....In order to be able to hunt legally, [i]in addition to a license, the hunter must have permission from the owner of the property on which they are hunting[/i] in the case of private hunting areas, and a specific permit is required for hunting in national hunting reserves or controlled hunting areas..."
Plus they must have a seperate licence to hunt with dogs - see link:

http://www20.gencat.cat/portal/site/OVT/menuitem.8d9f3f7e23c1cd519e629e30b0c0e1a0/?vgnextoid=73ec77b2954c4210VgnVCM1000008d0c1e0aRCRD&vgnextchannel=73ec77b2954c4210VgnVCM1000008d0c1e0aRCRD&vgnextfmt=detall&contentid=fcf9d10a5678a310d10a5678a3108d0c1e0aRCRD

There is some more information here on hunting:

http://www20.gencat.cat/portal/site/DAR/menuitem.8ea90a68a0f0f53053b88e10b031e1a0/?vgnextoid=81f66f2f199d2310VgnVCM2000009b0c1e0aRCRD&vgnextchannel=81f66f2f199d2310VgnVCM2000009b0c1e0aRCRD&vgnextfmt=default&newLang=es_ES

Plus if you want to check out the hunting law of 1970:

http://noticias.juridicas.com/base_datos/Admin/l1-1970.html

Perhaps if you wish to check out more on your rights the Spanish federation of Hunting may help:

http://www.fecaza.com/caza/leyes-de-caza.html#.UujbwrRwbIU