What is the young term used for both dogs and cats when they are newborns?

The term "pup" is used to refer to the young of both dogs and cats when they are newborns. This terminology reflects the early stages of their lives, typically characterized by their dependence on their mothers and their rapid growth during this initial period. The use of "pup" is widely recognized among pet owners and animal professionals, making it an intuitive choice for describing young canines and felines.

In contrast, other terms such as "kit" specifically refers to the young of cats (kittens), while "fawn" denotes a young deer, and "calf" is used for young cattle. Therefore, "pup" is the accurate and common language used to collectively describe the very young of these two beloved companion species.