My mom called yesterday and told me that Robby was acting funny and REALLY crabby. He was such a good boy only a few days ago.
So she had the vet out and his left back molar was dangling. If he was a really good horse she could have just went in there and ripped it out, but he's a sometimes-naughty-little-gelding.
The vet came out, sedated him, and pulled the tooth. All is good. He's eating and happy again. Horses!