Environmental enrichment provides variety through toys, perches, scratching outlets, hiding spots, and hunting-style activities. Vertical spaces—cat trees, shelves, and window perches—are especially important because cats love height. The appeal of boxes is real and well-documented: they provide enclosed safety, warmth, and a vantage point. Play itself is far from frivolous; it mimics hunting and reduces stress and behavior problems while bonding cats with their humans. Good toys include wand toys, balls, puzzle feeders, and crinkle toys, and rotating them prevents boredom. The "hunt, catch, kill, eat" play sequence mirrors natural predator behavior and keeps play sessions satisfying.
Many cats respond enthusiastically to catnip (Nepeta cataria), which causes euphoria and is safe to use; about 50–70% of cats are genetically sensitive to it. Silvervine is a popular alternative that may work on cats who don't respond to catnip. Windows provide important visual stimulation—often called "cat TV"—and specially made videos featuring birds and small animals entertain many indoor cats. Bird feeders placed near windows offer even better viewing, though cat owners must weigh the welfare of local wildlife. This is part of a broader conservation issue: outdoor cats kill billions of birds annually, and the "indoors-only" philosophy protects both cats and wildlife.
For indoor cats that crave the outside, a catio (an enclosed outdoor space) offers safe outdoor experience, and some cats can be leash-walked with patience and a proper harness—cats can slip collars, so a harness is essential. Indoor cats benefit from scheduled, intentional play sessions (sometimes called play therapy), food puzzles that engage the brain, climbing opportunities, and rotated toys. The distinction between toys and tools is useful: toys engage, while food puzzles work the mind, and both are essential for thriving indoor life. Many indoor cats sleep twelve to sixteen hours per day—sometimes more—reflecting an evolutionary drive to conserve energy from their hunter ancestry. Cats are crepuscular, meaning most active at dawn and dusk, and sudden bursts of frantic activity known as "zoomies" are common in the evenings.