I don't know what vet told her that her horse can't eat grass cause it is too sugary but I have never heard of that. Grass is the natural diet for a horse, but grass can colic a horse if it is not part of their daily diet. For example a stalled horse only gets … Read more

It could be him marking territory, take to vet, have kidneys and bladder checked. If all is well then I am stumped!!