There are two main types of pet heating pads: electrical and non-electrical. Heating pads that don’t use electricity could have a foil layer to reflect the pups' heat or be made from warm materials like fleece. Non-electric pads make great outdoor pet heating pads, as you don’t need to worry about the weather damaging electronics. Electric heat pads work by coils embedded into the pad, which you can adjust to different heat settings. If you’re around to check on your pet, you can use electric heating pads to keep your pet warm, but it’s important to monitor the heat levels and how long they rest on them. There are also microwaveable heating pads designed for puppies and kittens.