Over the last 3 decades, the use and popularity of canid models for basic and applied behavioral research has grown dramatically, and for good reasons. Dogs are uniquely among the human world, living and working in our homes and places of employment while an even greater population lives on the outskirts of human life, scavenging and navigating the city life. This provides a rich continuum of environmental contexts for the canine experience, leading to some unique and even human-like behaviors in animals. The articles in this special issue provide additional insight into factors that influence canine welfare, methods for evaluating dogs' preferences and the reinforcing effectiveness of stimuli, trick learning and retention, concept learning, and scent detection performance under sparse reinforcement conditions. Here we provide an overview of these articles and their contribution to our understanding of canine behavior.
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