After I took P to the university, they really had no idea what the problem was.
The University did do a biopsy of the lesions on the tongue, it came back neg. for cancer, Yea!
So after talking to the DVM dentist some more, the conclusion was a certain type of weed he was eating,that he had a bad reaction to. The dentist has seen this a lot, usually in the fall of the year.
I just took P to the DVM dentist Friday and we talked about it again, When he looked at P's mouth there were just a few specks of the black way in the back of his mouth. The dentist said the plant usually causes no to slight irritation in a horses mouth, but that P had a more severe reaction to it.
I have never seen a horse's mouth black like that, and he said that the drought might have had something to do with it. Since the drought was so bad last year I did not cut the pasture grass at all past June 1st, So the plant might have been able to grow last year where it was never able to grow before. I will be cutting the grass this year, drought or no drought.
As a side note, this black mouth thing, coincided with me buying a new bit for P.
And I attributed all of his attitude and discomfort to the black mouth. Well this spring I also figured out he hates the new bit. I took the new bit to the dentist with me on Fri, and we put it in P's mouth when he was sedated with the speculum in his mouth, to see how it fit. And the bit did not sit in his mouth very well at all. P was able to hold it fine, but the bit wanted to rock forward, putting pressure on his tongue.
Last edited by Clayton Taffy; 04-18-2013 at 10:18 AM.