Only Yaojing can have a pet with them and help them to lvl up.
but there is also another way for other clan to have a pet. just my personal opinion to call it as a pet.
create another character which is YaoShou.
then learn the skill turn yourself to tiger.
Choose follow function to your main character. then you can go anywhere you want, that tiger will follow you all the time.
why choose YaoShou as your pet
1. it has additional storage, 30 slot. better than you buy premium item to increase your storage again
2. YaoShou has more HP and defense . and it also can lvl up at same time.
3. No need to feed your another character, no need worry about loyality. because it is not a pet in real.
4. remember, you can ride on that tiger. YaoJing pet cant be ride.
see, not only yao jing can have pet. every clan can .
BTW, a heresay again, new emoticons- monkey