Almost 70% of U.S. households have pets, representing more than a twenty percent increase over the past 25 years. The vast majority of these pets are dogs and cats, but there isn’t a great deal of research on why Americans have become more likely to have pets.

There are studies that show that people who have a pet, especially a dog or cat, are in generally better physical and mental health as they age, as well as surveys revealing that more U.S. households have pets than children. In addition, the market for pet-oriented products and services has grown by 450% over the past 25 years.

But nowhere could I find any studies on why more households have pets. I did find a poll by Morning Consult that reported that pet owners felt their pets helped reduce stress and anxiety, provided unconditional love and support, offered companionship, and provided a calming presence.

Some 75 years ago, President Harry Truman made the observation that, “If you want a friend in Washington, D.C., get a dog.” Having spent almost 20 years in that politico-economic climate, I’d agree.

Every morning, our two dachshunds are glad to see me, and the same is true any time I leave them and then return, even if it’s only fifteen minutes. That kind of spontaneous joy almost never occurs in academia, law, business, or politics and happens but infrequently in the dogless household.

As Americans become more personally and socially isolated [and texting doesn’t reduce isolation] as well as politically polarized, the non-judgmental warmth and welcome of a dog becomes more and more attractive in a world that’s becoming colder, more impersonal, and more demanding. Even our cat is far warmer than most people I had to deal with in politics or that my wife has to deal with in academia.

But that’s just my observation, not a peer-reviewed, statistically grounded psychological treatise, although I’m sure our dachshunds would agree. The cat would likely refuse to take sides, but he’d still settle in beside me while I’m reading.