Heat loss burns up more calories/energy thus they need more food to compensate for this loss of energy, in a environment where there is little food for man or dog.
(Heat loss; burns up; more calories) (they; need; more food; to compensate for this loss of energy) Context(they need,List([45, 54))):(they; need more food to compensate; for this loss of energy)
they need,List([45, 54))
Heat loss they they
burns up need need more food to compensate
more calories
more food to compensate for this loss of energy
for this loss of energy