Huge boar!

[2003eclipse]

That was more than likely a domestic hog at one time they have much higher chances of growing to that size. Once a domesticated pig strays from its farm it will begin to become wild after only 3 days or 3 weeks not sure the exact time frame. 10,000 years of domesticating an animal can be undone in a short amount of time... They begin to grow back their tusks their hair changes from pink to black and they become farel hogs. I'm assuming that is most likely the case here.