same manner as the training lane, but restricts 

 the dog's attention to its immediate environment. 

 If desired, the rails may be covered on the out- 

 side with chicken wire and gates may be added. 



47. Method 



a. Step 1. As described previously, the search 

 chain substitution procedure is used. Initially, 

 each dog can be worked on one tripwire, placed 

 about 10 feet from the starting point and 1 foot 

 high. The dog is first introduced to the string 

 (wire) with the food pan partially under the 

 string and the dropper behind the string (fig 

 28). The search chain is employed, with the dog 

 going to the pan, eating the food, and returning 

 to the heel position. This will acquaint the dog 



with the string without instilling fear, and condi- 

 tion it to stop at string or wires. 



b. Step 2. Repeat step 1 with the pan centered 

 under the string. The distance of the string from 

 the starting point is increased until the dog 

 consistently goes through the search chain the 

 full length of the lane. 



c. Step 3. The food pan with one cube in it 

 is placed 1 to 2 feet beyond the string, which is 

 in the same position as in step 1. Here it is 

 advisable to use three strings at 6, 12, and 18 

 inches, to discourage the dog's jumping the 

 string to get at the feed pan. The handler will 

 follow his dog closely as it moves out. As soon 

 as his dog gives the slightest indication of hesi- 

 tation at the barrier, the handler reinforces with 



Fiyure 28. Feed pan under white string. 



33 



