Before you reach for the chemical flea repellent sprays if you suspect your dog’s bed might be infested, try trapping the pesky pests instead. When your dog isn’t on the bed, put it in a dark room and place a small lamp by the bed. Leave the light on, and put a bowl of very soapy water near the bed and light. The fleas are attracted to the warmth of the light and will fall into the trap. If you see fleas in the water, you can take steps to clean and disinfect the bed.