Why does my Shih a tzu suddenly have strange behaviour

My 5 year old Shih Tzu has been scratching the door and whining to get outside, not normal for him, and while out there, he runs away from me and not listening, again , very strange behaviour, he's always by my side, he is currently hiding under the bed, very strange behaviour for him, he's got me worried. I have had him for 5 years, he's been on planes, boat, vehicles, around other dogs, and never ever had any issues, I have no idea what it could be. Any suggestions at all would be appreciated...thank you...ps, this has all happened in the last 3 hrs

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