The Pet Age Test estimates age in dogs and cats from a mouth swab. Age estimates come with life stage determination from age/breed/weight and helpful insights based upon your pet's life stage for nutrition, health monitoring, behavior, and life style/safety. Technology: This DNA-based test uses cutting edge epigenetic biomarker technology to estimate your pet's age from DNA methylation, a widely published and validated method of age estimation in animals. Accuracy: The test currently has an accuracy of within a year of the actual age of the pet- a great improvement to the +/- 5 year estimates given by veterinarians using physical features alone. Test is recommended for pets above 1 year of age. Each kit comes with: Mailer box, the same box is used to mail back the sample Welcome letter, explanation of process Information sheet to send with sample to lab Swabs Tube with DNA preservative Return label