1. During a stealth practice the next day, Walker brings in the tracker dog . 2. Police using tracker dogs and helicopters were searching for the drivers. 3. A group of Swiss rescue workers with 10 tracker dogs joined the search Thursday. 4. Police and border police were searching for the men with tracker dogs and a helicopter. 5. Then, the Germans will have tracker dogs that will be able to find them that way. 6. The ever-increasing countermeasures of enemy foot patrols and use of tracker dogs also had its effect. 7. Tracker dogs were employed for the first time.8. Tracker dogs sniff for a missing Nordic icon.9. A Royal Air Force helicopter joined police with tracker dogs searching the hospital grounds and surrounding fields. 10. The manhunt with tracker dogs and aircraft began several days after he disappeared, when neighbors raised the alarm.
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