Prosecutors contend that the dogs were properly trained and handled and successfully tracked Laci Peterson's scent from a known location, the couple's Covena Avenue home, to the bay.
Tracking dogs follow scents of people believed to be alive. Cadaver dogs are trained to find bodies.
Anderson handles both kinds of dogs. She said her cadaver dog, Twist, indicated on Dec. 27, 2002, that a body had been put in a shed in the Petersons' back yard, while her tracking dog, Trimble, picked up Laci Peterson's scent at the marina on Dec. 28.
Earlier this week, another handler testified that her dog picked up Laci Peterson's scent on Jan. 4 along Highway 132 west of Modesto, a route police believe Scott Peterson traveled when allegedly driving the body to the bay.
Wednesday, Anderson said Trimble on the same day picked up Scott Peterson's scent for several miles along the same stretch of road.