Update: Now using harness on my new kitten, 6 months in attached pix. The cat I bought the harness for passed ;(The pictured leash is very comfortable (comfy enough for 8hr road trip)and I highly recommend. I’ve used it now to train cats of feral and domestic origins.Tips for kittens— wait until kitten is 4 months old before introducing or until belly fur has totally grown back in after spaying. Do not use this harness if your cat’s belly is shaved. You do not want to further irritate an area already irritated. If your cat stresses and starts obsessively licking their shaved belly, consult your vet to discuss treatment plans.After 4-6 months, you’ll have developed a trust with your domestic kitten, and trust is key to training a kitten or adult cat to tolerate a harness and leash. Start off by just letting your kitten/cat get used to wearing the harness around the house. First few times you put it on, they will flip around like a horse wearing a saddle for first time—- that’s normal! Once they are used to wearing it, attach the leash and walk them through your stairwell if you are in apt. building, or just inside the house or garage. Let them lead, this further builds their trust. When they stop, you stop. I even crouch down to their level when they stop. Only after they are comfortable to walking on leash and harness, should owner attempt to lead. Try using a short phrase like, Xena (pet name), come to lead them in owner’s chosen direction. Cats can learn short phrases. My Siamese cat, Sunny, of 19 years knew many short phrases, and learned to walk on a leash from age 6 months. Sunny travelled all over the world, and because she mastered leash walking as a kitten, enjoyed many airport strolls and was comfortable using her mobile litter box on long hauls. She never once flew in cargo.The harness/leash as conflicted as it sounds does offer your domestic pet independence. Kitten pictured on tree was snapped on her first outdoor experience, she’d only been in stairwell, indoor apartment, and car prior. You can see she doesn’t look stressed and is looking at her owner for approval before she inches further up.Good luck!This is a fantastic alternative to a buckle type of harness. I have used this leash both in airports and to walk my cat outdoors. Only once did she slip out and it was my fault for not properly fastening the around the neck velcro. My cat was in a park and saw a dog, she flipped out and started jumping and twisting, she totally pulled a houdini! I get so many compliments on this vest harness when we are travelling, many people want to know where to buy it. In Germany in particular she gets a lot of attention! I would highly recommend this as a safe, non stressful way to contain your cat while travel or outdoors. If your cat has never worn a vest harness before, you should introduce it slowly.. let your pet wear it several times for a few minutes, build up the minutes over several weeks before a trip or going out doors. In terms of tips for walking your cat on a leash, I recommend starting with a fixed leash like this harness comes with and then moving your way up to a retractable leash when your cat is more in control of themselves. Cats naturally want to climb trees, walls, and run free. Start off with the fixed leash and don't try to control the direction, let your cat lead. When your cat is fully used to the harness/leash, you can slowly try to get control. You have to be very patient and have a strong bond with your cat. I'd think if your cat likes you enough to come to you when called, they are a good candidate for leash walking. If your cat is super independent and won't even come when you call, probably not the type of cat that will take to a harness and leash. Good luck!