S sunnyyyyyyyyy Guest Jul 1, 2009 #1 Mammals give birth to live offspring, and not eggs (like birds). That's why a dog is a mammal.
N Noah New member Jul 1, 2009 #3 b/c a dog has all of the characteristics of Class Mammalia. All mammals have three characteristics not found in other animals: 3 middle ear bones, hair, and the production of milk by modified sweat glands called mammary glands.
b/c a dog has all of the characteristics of Class Mammalia. All mammals have three characteristics not found in other animals: 3 middle ear bones, hair, and the production of milk by modified sweat glands called mammary glands.
