Sorry if I'm being a partypooper but
Foxes are primarily carnivores, and they normally eat small mammals, birds, lizards and other small vertebrates. However, they are known to be opportunistic predators and have been known to eat small mammals like mice or shrews, snakes, insects and carrion.
While foxes could not eat a pizza directly, they may be attracted to the aroma and could potentially attempt to scavenge for leftover crumbs or food remains associated with a pizza. It is important to note that this behavior is not normal for foxes, and it could be harmful to them if they were to ingest large amounts of processed human foods like pizza.
It is important to remember that foxes are wild animals and should be observed in their natural environments. It is also important to avoid feeding them food that is not part of their natural diet, as this could lead to harm to the animal and damage to the local ecosystem.