The goal of orphan puppy and kitten care is to maximize their health, well being, and socialization until they can be placed on a foster mother or adopted. The needs of the healthy young are very simple, water, nutrition and the proper environment. Obviously these husbandry issues are more critical in the newborn and the sick than the healthy 8 week old.
The neonatal period is the first 4 week of life. During this critical period, the puppy or kitten has a different physiology and rate of development and than during the rest of the pediatric period. Once the puppy or kitten is 6- 8 weeks of age, then all of the development is complete and the youngster can be considered a "growing" adult.