Cat-a-lax is a hairball dissolving and laxative for treating constipation and problems caused by hairballs in cats.

Cats lick their fur clean daily. In the process, they swallow many hairs that can form small hairballs in the stomach. These hairballs are vomited regularly, occasionally clogging the small intestines. The cat's appetite then deteriorates and they no longer produce faeces. Vomiting is another symptom commonly seen. In outdoor cats, this is difficult to detect; they become quieter and especially skinny. A real hairball is caused by a lot of licking, called washing.