Hi, I adopted my first Chihuahua. He’s 5 months. His eyes are very watery. He keeps rubbing them with paws and squints. He's itching His body and coughing maybe 5Xs a day. I feed him dry. Was chicken. I switched to duck natural balance. I read about raw food for allergies. That doesnt sound appealing. I feel bad for him. Thinking it’s all related to allergies? Any advice would be appreciated!