My dog is hiding, but not from me?

My dog has had a sort of “anxiety” since me and my family first got him, but today he is acting particularly strange. He keeps wanting to go into my parents’ closet. He’s shaking, panting, whining, and sniffing around. At the same time, he’s not running away to his kennel from every human like he usually would, so... show more My dog has had a sort of “anxiety” since me and my family first got him, but today he is acting particularly strange. He keeps wanting to go into my parents’ closet. He’s shaking, panting, whining, and sniffing around. At the same time, he’s not running away to his kennel from every human like he usually would, so it’s like he’s either looking for something or hiding. Any ideas of what this could mean?
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