Crabs, or genital lice, are caused by parasitic insects (Pthiriasis). Genital lice are not the same as head lice, nor are they acquired from dogs, cats or other pets. Genital lice are treatable with prescription and over-the-counter medications.

The following sources provide excellent information about this infection:

Centers for Disease Control

New York State Department of Health

Planned Parenthood

American Sexual Health Association

NYU Medical Center


Go Ask Alice!: Q & A on sexual health issues

Mayo Clinic