By scattering morning and evening food on the earth for dogs, Chandalas and birds, a person should perform the Vishvadeva (sacrifice).
श्वभ्यश्च श्वपचेभ्यश्च वयोभ्यश्चावपेद् भुवि। वैश्वदेवं हि नामैतत् सायं प्रातश्च दीयते॥