Not many would know what Boanthropy means unless they google it or look it up in the dictionary. But there is a man mentioned in the Bible who suffered from this or a similar illness for 7 long years. He was the King of Babylon, Nebuchadnezzar. In Boanthropy, the sufferer believes himself/herself to be an ox or cow and they prefer to eat and drink what an ox or bull does- grass and water.
Nebuchadnezzar's illness was a punishment from God for his arrogance and wickedness. Actually God had warned him of the same in a dream...a dream which only the prophet Daniel could interpret.
Here's how Daniel interpreted the king's dream......
"This is the interpretation, O king, and this is the decree the Most High has issued against my lord the king: You will be driven away from people and will live with the wild animals; you will eat grass like cattle and be drenched with the dew of heaven. Seven times will pass by for you until you acknowledge that the Most High is sovereign over the kingdoms of men and gives them to anyone he wishes. The command to leave the stump of the tree with its roots means that your kingdom will be restored to you when you acknowledge that Heaven rules.
Therefore, O king, be pleased to accept my advice: Renounce your sins by doing what is right, and your wickedness by being kind to the oppressed. It may be that then your prosperity will continue." (Daniel 4:24-27)
The king did not repent of his sins and wickedness, so what the prophet had said came to pass in 12 months time........He was driven away from people and ate grass like cattle. His body was drenched with the dew of heaven until his hair grew like the feathers of an eagle and his nails like the claws of a bird. (Daniel 4:33)
The king later testified....At the end of that time, I, Nebuchadnezzar, raised my eyes toward heaven, and my sanity was restored......All the peoples of the earth are regarded as nothing. He does as he pleases with the powers of heaven and the peoples of the earth. No one can hold back his hand or say to him: "What have you done?" At the same time that my sanity was restored, my honor and splendor were returned to me for the glory of my kingdom. My advisers and nobles sought me out, and I was restored to my throne and became even greater than before. Now I, Nebuchadnezzar, praise and exalt and glorify the King of heaven, because everything he does is right and all his ways are just. And those who walk in pride he is able to humble. (Daniel 4:34-37)
The bottom line being.............those who walk in pride, God is able to humble.....even now.