What are some tips for introducing a third cat into a household with existing pets?

When introducing a third cat into a household with existing pets, it's important to do so gradually. Start by keeping the new cat in a separate room to allow the pets to get used to each other's scents. Slowly introduce them through scent swapping and supervised interactions. Provide separate food, water, and litter boxes for each cat to prevent resource guarding. Monitor their interactions closely and be patient as they adjust to each other's presence.