Is takes a lot of work and a great deal of consistancy to get a cat to function in one of these.  Wearing a harness goes against their instincts.  This is a good size for young cats - the best age to begin getting an animal used to something unnatural for them.  Having a cat conditioned to functioning on a harness/leash is extremely helpful in certain situations.  We travel in an RV for long periods of time and our current kitty comes with us.  He is not allowed outside without it.  We are able to take him out, let him experience nature and do his thing at campgrounds.  We are able to keep a clean "emergency" litterbox just as a backup.  Of course now we are using a larger size.  I used this one when he was an adolescent.  I would put it on and take it off several times a day and leave it on him for short lengths of time in between.  All this was indoors with no leash.  Every session was accompanied with lots of pets and treats to distract him from the annoying thing on him while he got used to moving in it.  It took awhile getting him used to tugs from a leash.  At first he would just hunker down but I always accompanied a tug with a call and more pets/treats.  After awhile he treated it the same as a verbal call and would trot over.  I use one of those light retractable leashes.  Since he has never been outside except in a carrier or with this on, it is just routine to allow himself to be subjected to the indignity at this point.

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