Not onions, no, and please do refrain from feeding those to Toby. They wreak utter havoc on the canine constitution.

[ He taps his pipe to his lower lip. ] No, if a dream criminal can easily confound our traditional senses in the ways that you speculate, we must identify other damning evidence he might leave in his wake. Some spiritual essence? Residue of the energy that the tapir mentioned?

[ He waves a hand to the chocolate dog in progress. ] Perhaps Inspector Toby can become attuned to this?