This provides nutritional value but also improves the taste and smell of the food so dogs love eating it. (thebarkbuzz.com)
In contrast, the sight and smell of food increased the activity in these neurons — again, within seconds — but only following food consumption. (sciencedaily.com)
Be sure to have clean hands (not smelling of food), and, once he's happy with the hand in the cage, try touching him gently. (wikihow.com)