To what group of placental mammals do dogs belong to?
Dogs belong to the group endotherms.
All placental animals are mammals. Placental mammals are the most successful of the major mammal groups (the other two being the marsupials and the monotremes). Everything from rodents to dogs to cows and even elephants, even you, are placental mammals. In fact, they are found on every continent and in virtually every habitat on Earth.
The Monotremes, Marsupials, and the largest group, Placental Mammals. Monotremes are mammals that lay eggs. The only monotremes that are alive today are the spiny anteater, or echidna, and the platypus. Marsupial's young are born in an extremely immature state; most female marsupials have pouches. Some marsupials include the koala, kangaroo, and the numbat. Placental Mammals are the most familiar group (meaning us), but also contains a diverse group of organisms from rats to dogs…