This is especially helpful for cats, to have reflective collars which can be seen in the darkness, as they are usually nocturnal animals, and wander independently on their own.
But even during the day, the winter months can be quite dark, and grey, so having a collar on your pet cat (or dog) is very helpful. These types of color's make pets visible to motorists, or even cyclists.
However, you obviously don't want to keep them outside too long, as winter temperatures can hit below zero, especially at night. Keep your pets in a warm place. Leaving a pet outside too long can cause hypothermia.
If you're going out for a long time, and have a cat, bring them in so they are not left out in the cold! Cats don't really like the cold anyway, they prefer hot places.
Try something which is more pet-friendly, wildlife friendly, environmentally friendly, and organic.
Make sure that you keep them away from these types of places, as they could endanger the dog, and yourself.
A lot of people will heat up their cars before using them in the winter. But, a quick check underneath the car on winter months only takes two seconds, and can save a cats life!
Try placing them somewhere warm. Inside the house.