To keep them from dragging your bait (dog food) away, I use what I call a "meatsicle". I throw meat scraps, dog food, etc into large plastic garbage bins. I mix it all up with used cooking oil and water and let it freeze solid. Then pour some hot water on the outside of the tubs just before you go out to dump your bait. The water causes it to "free up" from the bottom and the sides allowing you to tip it upside down, lightly tap with a hammer, and the plastic tub should come off.
Of course you need to be in a location that has below freezing temps like we do out here in sunny Alberta. I have my meatsicle placed 266 yds from my back yard where I can get easy access for a nice shot from off of my deck. Here is a photo of my latest victim next to the bait with my 243 T3 light.
