Yes, it is in Safari Zone (After you get the National Dex) and in Altering Cave.
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You cannot catch houndour in Pokemon leafgreen either get one from Pokemon emerald or Pokemon colosseum.
Since you can't catch houndour your going to have to trade the Pokemon colosseum houndoom to firered breed it then hatch the egg to get houndour or you can get one from emerald's safari zone.
You can catch a Houndour in the Altering Cave in Pokemon FireRed.
you can only get houndour in emerald
You get a houndour then evolve it i will update when I find out where to catch houndour