Potentially dangerous dog breeds flying into Spain must be muzzled during the post-entry check. If the dog is off the lead at home, the pet parent must make safety arrangements to ensure the dog stays within the perimeter of the residence and cannot escape and wander away.

' In the Middle Ages, this was an association of sheep ranchers who journeyed seasonally to distant locations to find grazing pastures. The Spanish Mastiff was in charge of defending them against wolves and other predators throughout their travels.