Passage 3.14.9
καὶ τάδε ἄλλα τοῖς ἐφήβοις δρώμενά ἐστι· θύουσι πρὸ τῆς μάχης ἐν τῷ Φοιβαίῳ· τὸ δὲ Φοιβαῖόν ἐστιν ἐκτὸς τῆς πόλεως, Θεράπνης οὐ πολὺ ἀφεστηκός. ἐνταῦθα ἑκατέρα μοῖρα τῶν ἐφήβων σκύλακα κυνὸς τῷ Ἐνυαλίῳ θύουσι, θεῶν τῷ ἀλκιμωτάτῳ κρίνοντες ἱερεῖον κατὰ γνώμην εἶναι τὸ ἀλκιμώτατον ζῷον τῶν ἡμέρων. κυνὸς δὲ σκύλακας οὐδένας ἄλλους οἶδα Ἑλλήνων νομίζοντας θύειν ὅτι μὴ Κολοφωνίους· θύουσι γὰρ καὶ Κολοφώνιοι μέλαιναν τῇ Ἐνοδίῳ σκύλακα. νυκτεριναὶ δὲ ἥ τε Κολοφωνίων θυσία καὶ τῶν ἐν Λακεδαίμονι ἐφήβων καθεστήκασιν.
The following rites also are performed by the youths. Before the battle, they sacrifice in the Phoibaion; the Phoibaion stands outside the city, not far from Therapne. At this place, each division of youths sacrifices a puppy to Enyalios, judging that the bravest god must appropriately receive in sacrifice what they consider to be the bravest of domesticated animals. I know of no other Greeks besides the Colophonians who are accustomed to sacrifice puppies; for the Colophonians also sacrifice a black puppy to Enodia. Both the sacrifice of the Colophonians and that of the youths in Lacedaemon are performed at night.