You're killing me! I've used bacon, and chicken livers, and fish parts from the fish we've cleaned, and I've put the trap in ten feet of water (and all the way up to about three feet of water), and off the side of the houseboat after we're cleaned fish right there, and in rocky places away from the houseboat. I have a crawfish trap that's made the trip with me many times, but to this day I've never caught a crawfish. My fishing buddies have been greatly entertained by the whole process, but that's about the only good that's come from it.
We have a crawfish boil at my house every April, but the mudbugs are shipped up from Louisiana! Maybe I just need to give up on the trap and start using just a strip of bacon on the end of a line like we did growing up. I do like the punctured dog food idea, though...........for my last try.