Is it permissible or forbidden for a veterinarian to treat pigs and perform surgeries on them, especially if that is a requirement for his postgraduate studies?

Treating pigs and performing surgeries on them for training purposes is forbidden because it involves cooperating with disbelievers in developing pigs, which are forbidden to eat. This constitutes cooperation in sin and aggression, which is prohibited. It is also impermissible for a Muslim to hire a disbeliever for forbidden matters. However, if Muslims are compelled to use this method to achieve a legitimate goal and a profession they need, there is no harm in it, because means that are otherwise forbidden become permissible if they lead to an overriding benefit. Necessities and benefits have a significant impact on Islamic legal rulings.