I tend to assume that a dragon should be more akin to a bird than a reptile, personally. Scales and feathers are not all that different. Lighter bones, frequent diet of relatively small items... now, I don't assume that the 'fire breathing' would require a higher internal temperature. More likely an arrangement somewhat like the ability to spit venom. Possibly containing a substance that ignites on contact with oxygen, if fire is really necessary, but more likely a type of venom or highly acidic toxin. Disable your prey, and start the digestive process at the same time.
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