Video surveillance caught a man setting a dog on fire in a sewer system.

It happened Saturday morning.  The video shows a dark sedan pull up to a sewer access point in northwest Harris County.  He walks back and forth from the sewer opening for a while then you see flames.

The Harris County Fire Marshall's office says the dog was a white pit bull.  Neighbors in the area say the owner of the dog was trying to sell the dog for $100 just the day before.