Hello, I have noticed all pets will follow a rogue after they vanish and stand on top of them regardless of where they run. The pets don’t attack but it’s a dead giveaway as to where the rogue is going. Please fix <3
Not a bug 
Burning Crusade Classic "Not a Bug" List - May 25, 2021
When pets are sent to attack an enemy and that enemy enters stealth, the pet will continue to follow the stealthed unit around but will not directly attack them until the unit breaks stealth or can be seen by the pet’s owner. This is correct and matches original Burning Crusade pet behavior.
While that is correct, i dont believe it is supposed to apply to Vanish. The instance that isnt bugged would be if someone sent a pet after you and you stealthed before it actually put you in combat. They should follow you around until you appear again. Vanish is supposed to clear all aggro tables and drop you out of combat, like FD sends the pet back due to clearing all aggro and dropping you from combat.
Do you know if that Not a Bug specifically includes vanish? because im pretty sure that is not the case.
Oh you’re right, yeah shouldn’t apply to Vanish.