I filled this up and it spilled everywhere =[ I moped it up a few times. Will it leave a residue that is harmful for pets?

Hi James. It doesn't contain any killing agents -- just an attractant. Just hose down the spill area. It's just designed for outdoor use.

I believe the bait is of natural nature but you could call the company. it is designed to hang outside only. I doubt that its harmful to anything because the way the trap should work is that the bait brings the flies into the trap and drown