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You can now buy a flame-throwing robot dog for under $10,000
(arstechnica.com)
This is a most excellent place for technology news and articles.
California allows roofers to have flamethrowers. They use them for curing something in the roofing tiles(? I don't know the proper term for those things. They're basically cardboard covered in tar and gravel, possibly a thin layer of asphalt?).
It was a bit unnerving the first few times I heard the roofers doing their thing.
They're called shingles, asphalt shingles being the most common in most parts of the US because they're relatively inexpensive.