I think my horse has protein lumps. He's been on box rest for 2 weeks now and I've given him unlimited haylage. Having realised what is giving him the lumps I'll cut back on hard feed and given him hay instead, but I wondered if heat made them more likely. Even though Comet is a Dales, he is not a good doer and drops weight easily so I keep him well rugged. He never feels overly hot, just nice and warm under his stable rug. Could I be over doing it and making the lumps worse?