The mod page also gives full details on how to load the mod and use it while playing the game. Because, well, it's a cat and it only does what it wants, rather than what you want. Of course, there is a note that if you choose a cat with the mod, the cat won't follow you into combat. They do not take up the follower slot so you can technically have two followers with this.'
They have full follower features excluding the relationship chat. 'You can have either a deathclaw, yao guai, gen1synth, gen2synth, cat, Mutant Hound, super mutant behemoth, raider dog, gorilla, radscorpion, or a vicious dog. This is from the description of the creature follower mod, which is now downloadable:
