Curiosity is the trait everything else builds on
Harness walking asks a cat to do something unnatural: explore open, noisy, unpredictable ground while attached to a person. The cats who thrive on it share a recognisable temperament — they investigate a new box before it has finished being opened, wander toward visitors rather than away, and treat a dropped pan as an interruption, not a catastrophe. That underlying curiosity matters more than breed, age, or energy level, because training can teach a curious cat the harness, the lead, and the routine, but it cannot manufacture the desire to be out in the world in the first place.
Recovery speed tells you more than boldness
Watch how a candidate cat handles the surprises she already meets. Every cat startles; the adventure prospect is the one who startles, assesses, and returns to what she was doing within moments rather than hiding for an hour. A cat who freezes stock-still outdoors is not calm — she is overwhelmed, and flooding her with more exposure will not fix it. Similarly, a cat who enjoys being carried briefly, tolerates her paws and belly being touched, and settles in a carrier for short periods has the handling tolerance that harness checks, roadside rests, and vet stops on a trip will demand of her.
Food motivation and play drive are your training tools
Harness training is a chain of tiny agreements — wear this strap, step through this doorway, walk past that dog smell — and each agreement is bought with something the cat values. A cat who works eagerly for small food rewards, or who lights up for a wand toy, gives you a currency to pay with at every stage. A cat who is indifferent to treats and toys is not disobedient, just harder to coach through the stages where the environment competes for her attention. Test this at home before you ever clip on a lead: if she will follow a treat trail across a new room, she has the makings.
Honest limits: some cats should stay home, happily
The kindest judgement in this whole decision is recognising the cat for whom adventures are a burden. A shy rescue who has only just learned to trust one room, a senior with stiff joints, or a cat who finds car travel a misery of drooling and crying is not a failed candidate — she is a cat whose best life is a rich indoor one, and a confident second cat or none at all may suit the household better than forcing the dream. Choosing a kitten or young adult with the right temperament from the start is far fairer than trying to remake a settled homebody.
If she passes those tests, prepare her properly
Start indoors with the harness alone for short, treat-paid sessions, graduate to a quiet garden, and only then to pavements, always with a secure, well-fitted harness she cannot back out of and a carrier she knows as a safe retreat on every trip. Keep her identification current, because an adventure cat's whole risk profile is being away from home. When you head out together, KinsLe's Pet Pass puts your cat's verified ID card and your contact details in one place, easy to show to a vet, a site warden, or anyone who helps her on the road.