What characteristic specifically defines the Class Mammalia classification for the Whippet?

Answer

Nourishment of the young via milk produced by mammary glands

The defining feature separating the Class Mammalia from other classes is the mechanism by which offspring are nourished: the production of milk through specialized mammary glands. Mammals also share other characteristics, such as typically being warm-blooded, possessing hair or fur, and breathing air using lungs. Furthermore, the Whippet belongs specifically to the group of placental mammals, indicating that its young complete their internal development within the mother's uterus, nourished via the placenta.

What characteristic specifically defines the Class Mammalia classification for the Whippet?
animalclassificationDogwhippet