The percentage of households that own dogs has held steady for the last four years, at about 38 per cent. Since 2008, almost 6 million more dog-owning households have come into the market. Households with cats have basically stayed flat between 2008 and 2014. In 2014, about 25 per cent of U.S. households had cats, or about 30 million households. Overall, more than half of U.S. households own either a dog or a cat. Among other animal types, reptiles have seen something of an increase in popularity from 2010 to 2014. In contrast, households with fish have declined.