Dragon type moves aren't really considered least effective towards anything, however, the only pokémon type that is weak against a dragon-type move is another dragon-type. Also, unless your chosen dragon type is a dual-type pokémon, it's absolute ONLY weakness is another dragon-type. However, if your dragon-type is several levels stronger than the other (and isn't a dual-type, by the way), then you can cause some serious damage to the other!
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Ice does X4 damage, Dragon type does X2. I hope that helps you! Resources: Serebii.net
Dragon types are gods, nothing is effective against dragon
Dragon type moves are not very effective against Steel types. Dragon and Ice type moves are super effective against Dragon types.
Dragon type. or ice types which is normally super effective
Dragon is super effective on its own type.
Dragon types are super effective against it's own type :)