Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to keep orphaned newborn puppies warm [title] Gradually warm the puppy. [step] An orphaned puppy that has gotten cold needs to be warmed gradually. Warming it too quickly can cause it to go into shock, which can further threaten its life.

Ending1: This can drastically reduce the quality of life the puppy has. The best way to warm a newborn puppy is in the early months of life. Ending2: [substeps] Begin warming your puppy at a lower temperature to start. Bring it up to room temperature before the puppies arrive and then take it to its veterinarian or if it has a medical condition such as regurgitation or deaf/hard of hearing. Ending3: [substeps] Instead of quick warming, gradually increase the puppies temperature over the course of a half hour to an hour. [title] Place the puppy on a gentle direct heating source. Ending4: Place the puppy in his carrier and let it warm gradually. [substeps] Throughout your warm-up stages, take the puppy out of its carrier when you suspect it may be sick.

Answer format: ending1/ending2/ending3/ending4