A few days ago the horse stopped eating and his gums were dark in color. Also when he would drink his water the water started getting sudsy, we changed the water and it continued to suds up. We even went as far to get a new container, again it suds up after he drank from it. They took him to the vet and she didn't know what was happening with him. He was started on antibiotics but he doesn't seem to be getting any better or any worse.
Have you ever encountered this problem? We're becoming worried about the other horses on the property, none of them are showing signs of being sick. We have no idea if it's something that is on the property or if someone might have intentionally done this to him.
Thank you for your help.