(Video: Companionship and support: Pets fill the void) In the video, the dog's main role is described as

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In the video, the main role of the dog is described as providing affection and companionship to the owner, filling the void of loneliness and isolation. Although dogs can also provide security and encourage exercise, the video emphasizes the emotional support and companionship that pets can offer.

(Video: Companionship and Support: Pets Fill the Void) in the Video