Pets can be obtained all around Arigon and are an integral part of gameplay from skilling to combat due to the Pet Perks that you assign them. Some may even come already loaded with Pet Perks associated with the skill/minigame that is used to obtain them.
When you receive a new pet it is HIGHLY recommended that you insure it for 5m GP to ensure it is not lost on death. This can be completed with 'The Pet Guy' located within in the Pet Dungeon located inside the salvage building.
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Location of the Pet Dungeon
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Pet Insurance Interface