The dog was seen at night, she had to hang on flashlight.

Easiest flashlight key chain hang on the collar. But there are drawbacks:
1. Flashlight time running dogs nonweakly loose, which is harmful for the eyes - on the need to make the brightness as possible and attach a flashlight to the collar in two places and tough.
2. When the next two dogs and more with this device, they can not tell - this flashlight should be used with filters again.

The light shines as close as possible to the location of the animal, should shine a flashlight straight down when finding it in the rest position. Due to intense traffic dogs current can get through vibration. For continuous burning torch to use a capacitor, which is charged at the time of the dog's movement and giving electricity bulb when resting dogs. These dogs, like Labradors love to climb into the water - so for them to do waterproof flashlights.