* The American Pet Products Association (APPA) estimates that 67% of US households own at least one pet. This represents about 85 million homes.
* The Humane Society of the United States reports that 68% of US households own a pet, and 83 million households have at least one dog.
These figures are based on surveys and estimations, and there's some variation depending on the year and the specific definition of "pet" used.
Therefore, you can safely say that over two-thirds of American households own pets.