Allowing pet cats to roam outside exposes them to significant dangers that can shorten their lives by two to three years, according to a recent review of global research. The study highlights that trauma from road traffic accidents, fights, and falls is the leading cause of death for free-roaming cats, with road accidents alone killing or injuring many cats worldwide.
In the UK, road traffic accidents were found to be the leading cause of death for cats up to eight years old, while European estimates suggest that 18–24% of cats are struck by a car during their lifetime, with around 70% of those incidents proving fatal. The risk is higher for younger cats and those that are not desexed, as they tend to roam more widely.
The dangers extend beyond roads: roaming cats face serious infectious diseases such as Feline Immunodeficiency Virus (FIV), frequent fights that can lead to fatal abscesses, and risks of poisoning or falls. Camera collar studies have shown that free-roaming cats often consume hazardous substances, cross roads, and explore dangerous areas like storm drains or roofs.
The simplest way to protect cats is to contain them on your property, the researchers say. This does not mean keeping them indoors at all times; owners can modify backyards with fence-top rollers or build a 'catio' – an outdoor enclosure – to allow safe access to fresh air. Many cats can also be trained to walk on a harness for supervised outings.
While containment is key, cats need entertainment indoors, including toys, scratching surfaces, and climbing spaces. The review estimated that outdoor cats live at least two to three years less than those kept contained, making containment a straightforward method to extend a cat's lifespan and improve its wellbeing.
