A video has been shared by @cactustherescue showing a rescue dog named Cactus refusing to wear a homemade watermelon helmet. The video was created by Mike Brown, inspired by others making fruit-based hats for their pets. Despite Brown's efforts, Cactus refuses to wear the helmet. Some viewers found humor in the contrast between Cactus's enthusiasm for eating watermelon and his refusal to wear it. The article uses AI to generate key points from this article, which may not always match what's in the article.