As long as people treat millions of pets across America like little humans, pet spending will probably keep climbing after a record 2013, industry spokesman Bob Vetere said Thursday.

According to the Associated Press, Americans spent an all-time high of $55.7 billion on their pets last year, and spending will creep close to $60 billion this year, the president and CEO of the American Pet Products Association told buyers and exhibitors at the Global Pet Expo in Orlando, Fla.

Overall pet spending has not dipped since record-keeping started, according to APPA, based in Greeenwich, Conn.

"The biggest part of spending in 2013 - $21.57 billion - went for food - a lot of it more expensive, healthier grub," according to the AP. "The not-for-profit trade association has been tracking industry figures since 1996, when total pet spending was just $21 billion. Adjusted for inflation, that's $31.3 billion."

Twenty years ago, the humanization of our pets started, Vetere said in a telephone interview to the AP.

As people made pets more important parts of their families, manufacturers introduced products that, in the beginning, helped the animals make their move from the backyard to the front room.

"What is feeding a large part of the growth now are the baby boomers who have become empty-nesters and are looking for some other ways to find the love and affection they used to get from their kids," Vetere said.

As people spend more on food than any other pet spending category, pet food trends follow human food and diet trends as well, he said.

According to the AP, that means if you are on a health kick, chances are your pet is, too. And if humans find a product that works for them, they will look for and demand the same for their pets, he said.

These foods are more expensive, but owners see their pets as "furry, winged and finny extensions of their family," Vetere said, noting that it didn't matter if the pets were dogs, cats, bird, fishes, horses or something else.

More age-specific, breed-specific, vitamin-infused or additive-enhanced foods are being bought by owners, Vetere said.

The health of people also plays a role in the robust outlook for the industry's future, Vetere said. "The body of science validating that pets are good for us is growing with strong research in numerous areas of health," he said.

Other spending included $14.37 billion for veterinary care, $13.14 billion for supplies and over-the-counter medicines, $2.23 billion for live animal purchases, and $4.41 billion for other services, the AP reported.

American pets include an estimated 95.6 million cats and 83.3 million dogs, the APPA said. There are also 20.6 million birds, 8.3 million horses, 145 million freshwater fish, 13.6 million saltwater fish, 11.6 million reptiles and 18.1 million small animals.