Some tamable pets, such as Rip-Blade Ravager, will now correctly change colors randomly when they are resummoned by the Hunter.
This will only apply to pets that are newly tamed starting in patch 2.5.3.

소환할 때마다 색이 바뀐다고 함~

https://eu.forums.blizzard.com/en/wow/t/burning-crusade-classic-253-development-notes/330732