One of the main reasons why foxes spray is to mark their territory. Foxes have scent glands located near their tails, and they use these glands to secrete a strong-smelling musk. This musk helps to deter other foxes from entering their territory, and it also helps to attract potential mates.
Communication
Foxes also use spraying as a form of communication. They may spray to let other foxes know that they are in the area, or to warn them of danger. For example, if a fox sees a predator, it may spray to alert other foxes to the threat.
Defense
Foxes may also spray as a defense mechanism. If they feel threatened, they may spray their attacker in the face or eyes. This can help to deter the attacker and allow the fox to escape.