Animal experts from the American Society for the Prevention of Cruelty to Animals are testing more than 100 pit bulls, Rottweilers and canine-wolf mixes owned by Marines serving at Parris Island, the Marine Corps Air Station and the Beaufort Naval Hospital.
The dogs are being assessed for various traits, including sensitivity and aggressiveness.
Emily Weiss of the ASPCA says that she expects only about 5 percent of the dogs will not pass the behavior assessments being given over two days.
Dogs that don't pass may no longer stay at the bases. Dogs that do pass get waivers to stay until 2012.