Yes, a dog is indeed a member of the phylum Chordata. This phylum includes all animals that have a notochord, which is a flexible rod made of cartilage that provides support during development. In addition to dogs, the phylum Chordata encompasses a wide variety of animals, including fish, amphibians, reptiles, birds, and mammals.
To break it down, dogs belong to the kingdom Animalia, within the phylum Chordata, and are specifically classified under the class Mammalia, order Carnivora, family Canidae, genus Canis, and the species Canis lupus familiaris. As mammals, dogs possess characteristics typical of this class, such as having vertebrates, being warm-blooded, and usually having live births.
In summary, not only is a dog a member of the phylum Chordata, but it also exemplifies many of the defining traits that characterize this significant group of animals.