A legendary pet lead has three stages of growth. It will take approximately 15 hours to reach the adolescent stage and an additional 25 hours to reach the adult stage, though this can be sped up by interacting with the pet. Stages can be skipped by using a Growth Surge on the pet, e.g. baby to adolescent or adolescent to adult.
A legendary pet lead does not need to be fed like a normal pet, although feeding it Tasty Treats will increase the rate at which it grows by 50%, and feeding it Jelly Treats will increase it by 100%.
Like all pets and summoning familiars, it cannot enter or use its abilities in certain areas.