By looking after the (domestic) animals he would secure great happiness. Having created the (domestic) animals, the Creator, assigned their care to the Vaishyas.
रक्षया स हि तेषां वै महत् सुखमवाप्नुयात्। प्रजापतिर्हि वैश्याय सृष्ट्वा परिददौ पशून्॥