Hugs. Eye foam is a symptom of mycoplasma gallisepticum. That can cause a sinus infection, and symptoms can be treated with Tylan, Baytril, Tetracylcine drugs, and Denagard. If you do decide to put him down or he dies, I would save his body and get the necropsy by your state vet who can do lab cultures for MG and also look for other diseases.