Passage 6.2.5
μαντικὴ δὲ ἡ μὲν διʼ ἐρίφων καὶ ἀρνῶν τε καὶ μόσχων ἐκ παλαιοῦ δήλη καθεστῶσά ἐστιν ἀνθρώποις, Κύπριοι δὲ ὡς καὶ ὑσὶν ἐπεξευρόντες ἔστι μαντεύεσθαι, κυσὶ δὲ οὐδένες ἐπί γε μαντικῆς νομίζουσιν οὐδὲν χρᾶσθαι· ἔοικεν οὖν ἰδίαν τινὰ ὁ Θρασύβουλος ἐπὶ σπλάγχνων μαντικὴν κυνείων καταστήσασθαι. οἱ δʼ Ἰαμίδαι καλούμενοι μάντεις γεγόνασιν ἀπὸ Ἰάμου· τὸν δὲ εἶναι παῖδα Ἀπόλλωνος καὶ λαβεῖν μαντικήν φησιν ἐν ᾄσματι Πίνδαρος.
Divination by examining young goats, lambs, and calves has long been established and well known among men, while the Cyprians have even discovered ways to practice divination by pigs. However, nobody at all considers dogs useful for divination. Thus it appears that Thrasybulus established some personal method of divination through inspecting the entrails of dogs. The so-called Iamidae became diviners descended from Iamus, whom Pindar in one of his poems claims to have been a son of Apollo, having received from him the gift of prophecy.