The smell of lemon is harmful to cats. Lemon has a pungent smell and cats’ noses are more sensitive. When cats come into contact with lemons, they will feel uncomfortable and sneeze. Furthermore, lemons have a sour smell. If cats accidentally eat them, they will get sick. It can lead to gastrointestinal discomfort, vomiting, and diarrhea. Eating a large amount of lemons can endanger the cat's life. Lemons at home must be stored carefully to avoid contact with cats.