Which pet is most popular among the US in terms of animal population?
According to statistics on US residents, dog-owning households outnumbered those owning cats, but the total number of pet cats was higher than that of dogs. Fish are the most popular pet as far as population is concerned.
These four rank within the top 5 among pet owners.
The following are estimated averages taken from statistics among multiple sources:
Fish: 150-172 million (includes freshwater & saltwater fish)
Cats: 88-94 million
Dogs: 75-78 million
Other Small Mammals: 16-24 million
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