The best way to find Krar Jnr is to just wait in Nemi Forest until it spawns. Players should bring something to do while waiting such as Alching, training Fletching, disassembling items, etc. If the last person leaves the forest while Krar Jnr is still there, the forest can change, and players would miss the chance to interact with Krar Jnr. Krar Jnr can "spawn" but not actually appear due to an NPC limit within the forest, so one should make sure that there is little to no NPC's in the forest before trying to find the pet.