Agni Purana (Jyotisha Selections) · by Vyasa
Chapter 5 · Omens
शकुनानि
मार्गावरोधको मार्गे चौरान्वदति भार्गव ।अलाभोऽस्थिमुखः पापो रज्जुचीरमुखस्तथा ॥ १७ ॥
In the full Agni Purana this is chapter 232, verse 17.
Blocking the road, it tells of thieves on the road, O Bhargava. With a bone in its mouth: no gain and bad. So too with a rope or rag in its mouth.
Simple meaning: A dog blocking the road tells of thieves. A bone, rope or rag in its mouth is bad.
सोपानत्कमुखो धन्यो मांसपूर्णमुखोऽपि च ।
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.