Most cat owners readily accept that their felines earn their keep only through snuggling sessions and the occasional dead bird on the stoop.

However, there are some ambitious cats that are truly working for their kibble, putting in a full day’s work in such industries as security, fitness and even meteorology.

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Lisa Rogak explores various types of kitty-held careers in her new book “Cats on the Job: 50 Fabulous Felines who Purr, Mouse, and Even Sing for Their Supper.” Read on for a sneak peek at some of the book’s featured felines.

Security guard cat

When toy company Bandai needed a security guard to watch over its toys in an English warehouse, the company bypassed the typical security breeds like Rottweilers and German shepherds and instead hired a Bengal cat named Millie (pictured above).

“Millie has always had a very vigilant personality,” her owner told British newspaper Metro. “I’m not surprised she took up a career as a security guard. The toys are lucky to have such an attentive guardian.”

Exercise cat

woman exercising with catWoman exercising with cat. (Photo: Mike Hollist/Rex)

Research shows that working out with a buddy is one of the best ways to stick to a fitness plan, so when Stephanie Jackson’s cat wanted to be held while she worked out, Jackson obliged.

She picked up her kitty, Bad, and used her as a 10-pound weight. After that, Bad became Jackson’s workout partner, and Jackson started taking photos of their fitness sessions. This led to an adorable kitty-workout calendar and later a bestselling book titled “Catflexing.”

Weather observer cat

Marty the Mount Washington Observatory catMarty the Mount Washington Observatory cat. (Photo: Mount Washington Observatory)

Cats have long been employed as mousers at New Hampshire’s Mount Washington Observatory, which sits at the top of the highest peak in the Northeast. As the only heated building atop the summit, the observatory attracts plenty of rodents, so a steady stream of kitties has been brought in to keep rat and mouse populations in check.

Today, a black cat named Marty makes his home at the observatory, entertaining tourists and assisting the night staff with weather observations through the graveyard shift.

Read more about Marty and other hard-working felines in Rogak’s book, which is out Oct. 6.