Do not store opened food in the garage, even temporarily. It is surprising how fast a line of ants can find their way to food that is left out. Even dry staples in bags or boxes can come under attack by ants, mice, and weevils fairly quickly. Use food quality storage bins if you must keep food items there, and make sure they are tightly sealed after each use. Spills of food or drink from entertaining should be wiped up promptly to avoid attack by ants, mice, and roaches.
Dampness in the garage can invite a whole different army of pests. Appropriate sealants on walls and floor will help to prevent seeping or water leaks from serving as a home for insects. A doggy bed that is infested with fleas will soon share fleas elsewhere in your home. Treat your pet and their bedding for flea control for their protection and yours.