Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Omens
शकुनानि
सोपानत्कमुखो धन्यो मांसपूर्णमुखोऽपि च ।अमङ्गल्यमुखद्रव्यं केशं चैवाशुभं तथा ॥ १८ ॥
In the full Agni Purana this is chapter 232, verse 18.
With shoes in its mouth, good. With a mouth full of meat also. A thing in its mouth that is unlucky, or hair, is likewise bad.
Simple meaning: Shoes or meat in a dog's mouth is good. Unlucky things or hair in its mouth are bad.
अवमूत्र्याग्रतो याति यस्य तस्य भयं भवेत् ।
A dog passing urine and going ahead of someone brings fear. Urine on a good spot or tree helps.
मङ्गल्यं च तथा द्रव्यं तस्य स्यादर्थसिद्धये ।
A dog wetting a lucky thing helps a person's aim. Jackals are read like dogs.
भयाय स्वामिनो ज्ञेयमनिमित्तं रुतं गवाम् ।
A cow crying for no reason is a fear sign. At night it points to thieves. A strange cry points to death.