Leashing a cat won't necessarily drive it "crazy", but prolonged restraint will undoubtedly lead to stress and potential danger. Cats crave freedom and enjoy climbing and exploring. It's generally best to avoid keeping them tethered with a leash. Leashes pose a significant risk of strangulation and can drastically alter a cat's personality. Furthermore, the use of a leash can be highly detrimental to a cat’s emotional and physical well-being. The restrictions and the inherent danger involved mean that better and safer alternatives should be sought.

Risks of Leashing a Cat
1. Suffocation Risk
Using a leash to restrain a cat carries a significant risk of death. This is not an exaggeration. Cats have a natural inclination to jump and climb, and a leash can easily become entangled, leading to suffocation. This is especially true in environments like pet stores where cats are sometimes leashed to prevent escape. They may repeatedly climb, causing the leash to shorten. The more they feel restricted, the more they struggle. If they are not quickly discovered, this can lead to death by asphyxiation within minutes. The potential for self-inflicted strangulation cannot be overstated, and the risk is simply too great to justify the use of tethers. Instead, create a safe and comfortable area for the cat that doesn't involve restraints.
2. Personality Changes
Cats are naturally sensitive creatures, and they are always on high alert to any unknown situations or places. Their inherent nature, which also includes a feral side, makes them react to leashes in ways that could alter their behavior. If a cat is constantly kept on a leash, this can make it more timid or, conversely, more aggressive and difficult to handle. This also leads to an increased risk of scratching and biting. The most reasonable and safe ways to keep a cat is either to allow it to roam freely indoors within a secure home or to keep it in an enclosure that is large enough for it to move around comfortably. Avoiding the use of leashes should be a priority for any responsible cat owner looking to maintain the well-being of their cat. Keeping them in a controlled, but not restrictive environment, provides the necessary safety and stimulation they require.