Was there ever a definitive description of how dragons and fire lizards defecate and what was done about it? I have read some descriptions saying that they do so between, while other sources stated this was not so. I also remember reading somewhere that the glows fed off of it like fungus.
One thing I did find was in SoP:
Eight families, gradually clearing enough land to grow essential crops as well as round up wild herdbeasts, had settled the valley that spread out north of Honshu. They protected their cluster of buildings and beastholds with dragon dung and firestone mash, the best deterrents for any pests in the south, apart from trundlebugs. Visiting dragons-and those staying at Honshu after the Fireball had added considerably to the perimeter-were encouraged to donate. Once the residues dried, there was little smell to aggravate human sensitivities, but what there was was sufficient to put off all but the hungriest predators.