I use the lid to a big rubber made container. Whatever they don't eat gets rinsed off into my lasagna garden (sheet composting) and covered with a layer of pine needles or horse manure.
This keeps me from having a buildup of spoiled treats on the ground, since I feed a lot of produce, leftover meat and other kitchen scraps.
This keeps me from having a buildup of spoiled treats on the ground, since I feed a lot of produce, leftover meat and other kitchen scraps.