All of our harnesses come in three sizes (small / medium / large), and each size has a range of adjustability on both the front and back straps.
The range is designed so that from the youngest of kittens to the largest of cats, there will be a Gatsby harness that is the perfect size for them.
You can find the size ranges (along with our guide on measuring your cat) here.
Will one harness size fit my cat all the way through their growth?
There is a LOT of adjustability in all of our harness sizes, so there is a very good chance that you will be able to use a single size and adjust it as your cat grows. Obviously this depends on your particular cat and how much growing they will do - but as an example, one of the models on our store, Lola - still wears the 'small' size Gatsby harness that she first wore as a kitten, even though she is now 4 years old and fully grown.
When is the best time to introduce my cat to a harness?
It is absolutely possible to harness train kitties of all ages, but as with most things - starting early makes the job a lot easier! We recommend getting your cat started with their harness training as early as you can. If you do choose to go with a different style of harness at first and then want to migrate your cat to the Gatsby, it's worth just being aware that it can take cats a short time to adjust to a new harness style.
Whatever your kitty's experience level, when receiving your Gatsby harness we recommend following our harness training guide with your cat, to help them settle in and get the most out of their harness. You can find our harness training guide here.