"Men are more willing to put in the time and effort of taking care of a pet," said Rebecca Cullen, an analyst at Mintel. "Women are more likely to feel they are away from home too much and that pets require too much work."
All of this is has big implications for the US$63 billion pet industry, which has grown three-fold since 1996.
Last year Americans spent US$11 billion on pet-pampering alone. One-third of owners said they bought toys for their pets, while 17 per cent bought pet costumes and 10 per cent shelled out for pet strollers, according to Mintel, which surveyed 2001 adults for its findings.
Pets are becoming a replacement for children
"When you're preparing for your first child, you're reading all the books, doing all the research," said Nathan Richter, 36, a partner at Wakefield Research, a market research firm in Arlington. "That's how millennials are approaching pet ownership."
A majority of millennials - 76 per cent - said they are more likely to "splurge" on their pets than for themselves, including for expensive treats (44 per cent) or a custom bed (38 per cent), according to a 2014 study by Wakefield Research. By comparison, 50 per cent of Baby Boomers - those born between 1946 and 1964 - said they would do so.
Millenials were also twice as likely than Baby Boomers to buy clothing for their pets, a phenomenon Richter chalks up to the prevalence of social media.
"The clothing is, for them, an opportunity for performance - they put it on their dog or cat, take them for a walk, post a picture on Facebook," Richter said. "It's increasingly about getting a digital stamp of approval."