A family concerned when their infant developed coughing and shallow breathing. Despite medical advice, symptoms continued, along with fatigue and poor sleep. At the same time, their dog began scratching a nursery wall behind the crib. The unusual behavior intensified, prompting investigation. The family discovered a hidden plumbing leak causing moisture buildup and mold inside the wall. This environmental issue may have affected the infant’s respiratory health and attracted the dog’s attention. After repairs and cleanup, the family improved air quality. The case highlights the importance of noticing health symptoms and animal behavior as potential signs of hidden household problems.