Bite, Roar, Ember and Flamethrower (TM, obviously). Just curious if you guys would wait a little while longer or not? I know moves wise if I do it this early, Arcanine won't be able to learn some moves.
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Growlithe gets Flamethrower at level 49 ; Arcanine gets Extremespeed at level 49.
You'll probably want Extremespeed, so you're better off evolving it earlier and getting Flamethrower via TM. If you don't have a TM handy and want an alternative Fire attack, wait until level 31 when Growlithe learns Flame Wheel.