How do i create a mob that fights on the players side?

So ive been trying out the AI for a teamable mob that fights for the player and does everything a tamed wolf does but it never works properly as sometimes the mob randomly wanders when its supposed to follow me and it doesn't even follow the player properly and it does not attack mobs that try to kill the player.

Ive watched two or three tutoriels and they did not work either.

Please if you know how to fix this then tell me.

Heres the AI and behavior setings

https://drive.google.com/file/d/1jQMaYst1vlpadVrAuraMIk-fWwHt9Idb/view?usp=sharing

https://drive.google.com/file/d/15pMw0OGum7PU6AtI5GI5qa2J7yDqttPH/view?usp=sharing