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Keywords: cost-benefit analysis; cost-effectiveness; detection dog; eradication; invasive species; scent; threatened species; análisis de costo-beneficio; erradicación; especie amenazada; especie invasora; olfato; perro detector; rentabilidad Perhaps the most useful of the studies that reported costs were those that compared detection dog costs to alternative techniques and provided a full itemization of the expense categories. A number of studies purchased dogs either from shelters or from professional sources for the purpose of the study; dogs sometimes worked with multiple handlers. Eleven studies compared dogs with human surveyors, although 3 of these simply made limited comments without providing supporting evidence (e.g., that dogs can reduce time and cost compared with human-based surveys [Nielsen et al. [54]], dogs are 5 times faster than humans [Bennett [7]], and dogs are 19 times faster than humans [Cristescu et al. [16]]). [Extracted from the article]