Fading puppy syndrome (or fading puppy complex) is when a puppy dies within the first few weeks of life without a clear cause of death or clinical signs, that is to say, they fail to thrive.[1] Death usually occurs within the first five days of life,[2] but can happen up to ten weeks of age.[3] It is responsible for about 50% of deaths of newborn puppies.[4]
Around 30% of pedigree puppies die in their first few weeks of life, with only about half of them dying due to identifiable causes.[1]
^Evermann, James F.; Kennedy, Melissa A. (2011-01-01), Peterson, Michael E.; Kutzler, Michelle Anne (eds.), "Chapter 16 - Viral Infections", Small Animal Pediatrics, Saint Louis: W.B. Saunders: 119–129, doi:10.1016/b978-1-4160-4889-3.00016-4, ISBN978-1-4160-4889-3, PMC7152367
^England, Gary (2012). Dog Breeding, Whelping and Puppy Care. John Wiley & Sons. p. 297. ISBN9781118414354.