Cats can trigger asthma for the following reasons, asthma is short for bronchial asthma, a chronic inflammatory disease of the airways, but also a disease caused by the complex interaction between a variety of environmental factors, genetic factors. In particular, among the environmental factors, allergenic substances are the most important and are the initiating link of acute asthma attacks. There are many allergens in nature, including animal hair dander. Cats are mammals, one of the common domestic animals, and should not be kept by people with asthma, as they are very likely to trigger asthma. On the one hand, there may be some allergenic animal proteins in the cat’s fur; on the other hand, the cat’s fur may also harbor pathogenic microorganisms, such as fungi, and can also harbor dust and mites. All of these substances are the most common allergens that induce asthma, therefore, it is entirely possible to have a cat that induces asthma.