Scent games work better before the walk than after
Published by Planète Pets · managing editor: Clément Lacaille · how our guides are written
The sequence sounds sensible: walk the dog, let him burn off energy, come home to a calmer animal, and that is the moment for a snuffle mat. A study on detection dogs suggests the opposite order. Our stimulation guides are gathered in the dog toys and enrichment section.
Contents · 4 sections
An odds ratio of 1.49 between before and after
Angle, Wakshlag, Gillette, Steury, Haney, Barrett and Fisher published in 2014, in the Journal of Nutritional Science, an open-access study on the effects of exercise and diet on olfactory capability in detection dogs (see the study). Seventeen certified Labrador retrievers, averaging about 27 kg and 25 months, worked a laboratory scent wheel before and after thirty minutes on a treadmill, five days running. The targets were three explosives, with median detection thresholds ranging from roughly 0.015 to 0.15 g depending on the substance.
The headline result is an odds ratio: dogs were 1.49 times more likely to locate the target before exercise than after (95 % confidence interval: 1.26 to 1.76; p < 0.001). That is not a marginal difference, and it concerns trained, fit animals tested indoors under controlled conditions. The same study also reports a second, dietary effect favouring a diet enriched in polyunsaturated fat (odds ratio 1.42; p = 0.009).
A plausible explanation, but not one this study demonstrates
The study records the drop without identifying its cause: neither body temperature nor panting rate appears among its quantified results. The most commonly cited explanation comes from earlier work by Gazit and Terkel, published in 2003 in Applied Animal Behaviour Science (see the study): a dog cannot sniff and pant at the same time. When heat has to be shed, breathing switches to thermoregulation, and the slow, fractionated airflow that feeds the olfactory epithelium suffers. It is coherent — but it should be presented for what it is, an explanation rather than a measurement.
What this changes about planning a session
- Put nose work at the start of the outing, on a rested dog, rather than as a wind-down after a run or an intense ball session.
- Separate the two activities instead of stacking them: the snuffle mat indoors in the morning, physical exercise later in the day, works better than compressing everything into one hour.
- Do not read a failure as a lack of motivation: a dog who "stops searching" at the end of a long summer walk may simply be panting. Our breed-specific nose exercises are detailed in our guide to scent games for a beagle.
Frequently asked questions
Should scent games be dropped after a walk?
No. The study shows reduced performance, not absent performance: a tired dog still searches, just less efficiently. The point is mainly to avoid judging his nose on an end-of-walk session.
Does this apply to a pet dog?
The study covers seventeen Labrador detection dogs, one breed, one level of effort, in a laboratory. Nothing says the size of the effect is the same in a family dog — but the respiratory mechanism invoked is in no way specific to working dogs.
How long does the drop last?
The study does not say: it measures before and after, with no recovery follow-up. In practice, waiting until panting is back to normal remains the simplest cue. Find all our guides on the dog hub.
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