Analysis of Tom's Little Dog

Tom told his dog called Tim to beg,
And up at once he sat,
His two clear amber eyes fixed fast,
His haunches on his mat.Tom poised a lump of sugar on
His nose; then, "Trust!" says he;
Stiff as a guardsman sat his Tim;
Never a hair stirred he.

"Paid for!" says Tom; and in a trice
Up jerked that moist black nose;
A snap of teeth, a crunch, a munch,
And down the sugar goes!