You might be satisfied to conclude harness training here and proceed outdoors. But you can also practice directing where your cat walks on leash indoors a bit (rather than just following him) before you go outside, since you’ll need to direct him once you’re outside. Here’s how you can encourage your cat to walk along with you: Using a sweet, soft voice, encourage your cat to follow you. Drop him a treat, and while he eats it, walk away to the end of the leash. When he catches up to you, praise and reward him with another treat. Repeat this over and over.