A "dog-proof" trap ... while it does hold its "toes" ... it is totally different than what most people think of a miniature bear trap ... it is a pipe, that the raccoon has to put it "hand" in ... it won't catch a dog ... very slight chance of a skunk ...
When using a cage trap like pictured above ... while wiring the bait in place is a good idea, it is also a good idea to hook the trap down to the ground ... a piece of re-bar bent into a "L" and placed between the wiring from top to bottom, then hammered into the ground will work, some people use a cement block, or log on top to hold it down ... if a big raccoon gets in there and starts thrashing around ... and tips it over, the door can get unlatched, and coon goes free ... or one of its buddies from outside, tis it over, same results ... a trap smart coon!