Brihat Jataka
लग्रांशकाद् ग्रहयोगेक्षणाद्वा वर्णान्वदेद्वलयुक्ताद्वियोनौ ॥ दृष्ट्या समानान्प्रवदेत्स्वसङख्यया रेखां वदेत्स्मरसंस्थैश्च पृष्ठे ॥ ३-४ ॥
The colour of the body of the animal should be ascertained from the colour of the navamsha sign in the lagna or from the colour of the planet associated with or aspecting the lagna whichever is stronger. The number of planets located in the 7th house and aspecting the ascendant àetermine the number of lines (such as on dogs) on the back of the animal.
english translation
lagrAMzakAd grahayogekSaNAdvA varNAnvadedvalayuktAdviyonau ॥ dRSTyA samAnAnpravadetsvasaGakhyayA rekhAM vadetsmarasaMsthaizca pRSThe ॥ 3-4 ॥
hk transliteration by Sanscript