Is a dog a mammal?

The story behind the answer

Yes. Dogs are mammals because they are warm-blooded vertebrates with fur, give birth to live young, and mothers produce milk from mammary glands to feed their puppies. Like other mammals, dogs also have three middle ear bones and a developed neocortex in the brain.

For context, dogs belong to the order Carnivora and the family Canidae, and were domesticated from gray wolves at least 15,000 years ago. A handy memory trick: “Milk means mammal.” If an animal nurses its young with milk, it’s a mammal—whether it’s a dog, whale, or bat. Dogs’ reliance on maternal milk early in life is a classic mammalian hallmark.