LED Dog Collar
Dogs with dark coats--black Labradors, for example--can be hard to see at night. So if you're hiking, camping, or fishing after dark, you can easily lose sight of your pet. This $5 flexible collar has an LED light that you flip on after sunset. Think of it as a doggie glow stick. The battery is good for 60 hours of continuous use, or 80 to 100 hours intermittently.