Looks like dogs are still man's best friend…
According to a survey of American pet owners, more households have a Fido than any other furry (or not so furry) friend. By sheer numbers of each actual pet though, there are more Nemos swimming in American fish tanks (as people generally keep more than one fish) and more cats than dogs (as there are multi-cat homes than multi-dog homes).
The 2007 National Pet Owners Survey, conducted by the American Pet Products Manufacturer's Association, broke down the pet preferences of Americans. In the United States, people own:
* 142 million freshwater fish
* 88.3 million cats
* 74.8 million dogs
* 16 million birds
* 24.3 million small animals
* 13.8 million horses
* 13.4 million reptiles
* 9.6 million saltwater fish
The survey showed that pet ownership is at an all-time high in the United States, with 71.1 million households owning at least one pet (that's 63 percent of all U.S. households). The first survey, conducted in 1988, reported 51 million pet-owning houses.