Yup that is true.
But these were the harder ones.. rest was already described in numerous other guides and are all from vendors i thought.
Anyway in the future I will update this thread with all the pets
Thanks for pointing it out!
M0GUL-Thrall Droid isn't from a vendor. And the Minimech CE technically isn't either :P
But yes, Vanity Pets can be out along with a companion. They will also stay out when you are on a speeder. And they do not fight...though, I've had my Little Sandcrawler tank things occasionally.