American dog ticks (IMAGE) Rutgers University Caption Three American dog ticks (Dermacentor variabilis): two females and one male. Credit Jim Occi/Rutgers University-New Brunswick Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.