Overview

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. Death usually occurs within the first five days of life, but can happen up to ten weeks of age. It is responsible for about 50% of deaths of newborn puppies.

Around 30% of pedigree puppies die in their first few weeks of life, with only about half of them dying due to identifiable causes.

Educational information only. This page is general guidance and is not a substitute for professional veterinary advice. Never give medicines or change treatment without consulting a veterinarian. If your pet is unwell, contact OC Pets or seek emergency care.

Sources (reused under open licences, with thanks): Wikipedia — “Fading puppy syndrome” (CC BY-SA 4.0) · Compiled by OC Pets Veterinary Clinic, updated 15-06-2026.