Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to keep newborn puppies warm and clean [title] Choose a warm area for your shelter. [step] When picking a place to keep your puppies, choose a warm area of your home. The area should be away from drafts and vents for optimal warmth.

Ending1: Do not choose a place with open windows or an open door, as these are not useful for protecting your puppies from strong odors or drafts. [substeps] Keep your shelter in a location accessible to your puppies. Ending2: [title] Display your dogs toys in a warm spot. [step] Avoid standing directly in front of a radiator or somewhere that receives lots of sunlight, like outside. Ending3: [substeps] Back corners and anywhere that is near a draft source are good choices. If possible, choose an area that does not get too cold in the winter. Ending4: If you're keeping the puppies outdoors, store them in an area away from the elements like a shed or the garage. [substeps] Never keep your puppies outdoors during a cold winter or hot summer.

Answer format: ending1/ending2/ending3/ending4