Fig. 3

One of the dogs on the pressure plate. W1 = unimpeded walking without a weight; W2 = carrying a standard 0.5 kg dummy; W3 = carrying a 2.0 kg dummy; W4 = carrying a 4.0 kg dummy
One of the dogs on the pressure plate. W1 = unimpeded walking without a weight; W2 = carrying a standard 0.5 kg dummy; W3 = carrying a 2.0 kg dummy; W4 = carrying a 4.0 kg dummy