Matted fur is a condition that occurs mostly in longhaired cats when their fur becomes knotted and entangled. There are several reasons this can happen. When a cat sheds their undercoat, the fur can become caught in the top coat. If a cat’s fur becomes dirty or oily, it can also become entwined and matted. Matting can also occur in places on the cat’s body that involves a lot of movement such as between the legs, under the chest, and around the collar.

Cats are typically fastidious groomers and therefore ingest a significant amount of hair. Hair is undigestible and usually sits in the stomach until enough hair is accumulated to produce a signal that induces vomiting. Even though people often say their cat is “coughing up a hairball,” this is not the correct terminology. The hair is coming from the gastrointestinal (GI) tract, not the respiratory tract (lungs).