Search Dog Handbook - Scott County Search and Rescue K9 Unit

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SEARCH DOG HANDBOOK However the dog may have a great deal of trouble telling the difference between two sets of footprints that crossed each other if they were made at the same time and by persons of about the same weight and shoe size. There is, of course, the question of three hour old footsteps of a 200 pound man and two hour old footsteps of a 100 pound man. Discrimination will be relative to training. It is important to note that a dog may “appear” to be following footsteps which are associated with a particular person, when in fact he is following the dead plant vapour which provides him with no information for humanoid differentiation. This performance is relative to training. Dehydration and Rehydration of Rafts on the Ground For bacterial activity to continue, a certain amount of moisture must be present. Very hot and dry atmospheres dry up the nutrients (rafts, plant cells) of the bacteria to the point where activity will cease. Bearing this in mind, consider variations in humidity. Rafts deposited in the early afternoon of a hot day will start drying up. Bacterial activity will go into the process of diminishing. However, during the early evening, dew forms on the blades of grass. This rehydrates the cells, and the few remaining bacteria once again have their food supply. The bacteria multiply rapidly and the total process is reactivated, most likely giving off a higher vapour intensity than when the rafts were originally dropped to the ground. If one views this over a specific time span, one would see the following process: when first dropped, the vapour intensity would be moderate. In the afternoon the level would start to diminish. In the early evening (with dew and lower temperature) the level would pick up. By late evening the level would be quite high. This would indicate that even though the rafts were deposited around noon, the chances of perceiving them would be best that evening. On the other hand, rafts deposited in the evening have their process slowed down during the night. The following morning they are rehydrated from the dew and the process is accelerated as the temperature approaches optimum conditions. Thus they are more easily perceived in the morning. Page 20
SEARCH DOG HANDBOOK Foliage Vegetation provides shade and moisture to the bacterial activity of the rafts and dead plant cells. We can also have variations due to the shading effect of broad leaf plants. For example, rafts of a footstep may become exposed to direct sunlight, killing a certain percentage of bacteria. As the sun moves, the bacteria become shaded again, increasing their activity. As a consequence, the activity may have been at a high level, become lowered, and then reactivated to a high level. Page 21
Page 1 and 2: SEARCH DOG HANDBOOK Facts and Figur
Page 3 and 4: SEARCH DOG HANDBOOK Also dedicated
Page 5 and 6: SEARCH DOG HANDBOOK Preface From ti
Page 7: SEARCH DOG HANDBOOK WHY USE A SEARC
Page 10 and 11: SEARCH DOG HANDBOOK 5) A search dog
Page 12 and 13: SEARCH DOG HANDBOOK 25) Mornings an
Page 14 and 15: SEARCH DOG HANDBOOK LOGISTICS 37) D
Page 16 and 17: SEARCH DOG HANDBOOK THE WEATHER (al
Page 18 and 19: SEARCH DOG HANDBOOK MISC 76) There
Page 20 and 21: SEARCH DOG HANDBOOK GLOSSARY and DE
Page 22 and 23: SEARCH DOG HANDBOOK Air Scent Dog T
Page 24 and 25: SEARCH DOG HANDBOOK Rafts Dead skin
Page 26 and 27: SEARCH DOG HANDBOOK Rafts on the gr
Page 30 and 31: SEARCH DOG HANDBOOK SECTION 3 SCENT
Page 32 and 33: SEARCH DOG HANDBOOK Plume Rise from
Page 34 and 35: SEARCH DOG HANDBOOK From a paper, W
Page 36 and 37: SEARCH DOG HANDBOOK The handler who
Page 38 and 39: SEARCH DOG HANDBOOK The total surfa
Page 40 and 41: SEARCH DOG HANDBOOK TRACK OR AIR SC
Page 42 and 43: SEARCH DOG HANDBOOK WEATHER (also s
Page 44 and 45: SEARCH DOG HANDBOOK PICKING A DOG H
Page 46 and 47: SEARCH DOG HANDBOOK HANDLING EVIDEN
Page 48 and 49: SEARCH DOG HANDBOOK A greater propo
Page 50: SEARCH DOG HANDBOOK Page 42 INDEX

Search Dog Handbook - Scott County Search and Rescue K9 Unit

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