Dogs are cognitively sophisticated animals that require mental stimulation alongside physical exercise, and cognitive enrichment through training, puzzle toys, and nose work provides welfare benefits beyond what physical exercise alone can achieve.
The cognitive welfare needs of dogs are frequently subordinated to physical exercise requirements — owners who walk their dogs twice daily may still have cognitively understimulated animals. The brain is energetically expensive, and engaging it through cognitive tasks produces genuine tiredness and satisfaction. Nose work is particularly powerful as an enrichment activity because it engages the olfactory cortex that represents a disproportionately large part of the canine brain — dogs doing scent work show reduced stress hormones and increased positive behavioral indicators. Training as enrichment differs from performance training in prioritizing the dog experience of problem-solving and success over the human goal of reliable behaviors. The welfare benefit of daily cognitive enrichment is well-documented and implementable at minimal cost.