The images were published here on Facebook on December 3, 2020. The post has been shared more than 20 times.
Screenshot of the Facebook post.
The image on the left purports to show Biden wearing a grey medical boot on his left foot; the image on the right shows him wearing a black boot on his right foot.
A screenshot of a tweet by US President Donald Trump has been added in the bottom left-hand side of the post image.
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The post's traditional Chinese-language caption translates to English as: "Left foot one moment, and right foot the next! / Someone is too mentally impaired to remember which one of his own feet has been injured!"
Biden fractured his foot while walking his dog Major on November 28, 2020, AFP reported here.
The images were also shared hundreds of times here and here on Facebook; and here, here and here on Twitter alongside a similar claim.
The claim is false; the image that purports to show Biden wearing the boot on his left foot has been doctored.
A reverse image search on Google, followed by a keyword search, found the original photo published here on the Instagram account of animal welfare organization Delaware Humane Association. It was shared on November 17, 2018.
Screenshot of the Instagram post by Delaware Humane Association
Below is a screenshot comparison between the image from the misleading Facebook post (L) and the Instagram photo published by Delaware Humane Association (R):
The photo in the original Instagram post shows Biden wearing no face mask or medical boot.
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The Instagram post's caption states in part: "Today is Major's lucky day! Not only did Major find his forever home, but he got adopted by Vice President Joe Biden & Dr. Jill Biden! The Bidens have gotten to know Major while fostering him and are now ready to make the adoption official. Best of luck and thank you for being one of our Friends for life!"
The photo of Biden wearing a black boot on the right foot from the misleading posts was published by Getty Images and featured in US news reports here and here.
The tweet by Donald Trump seen in the misleading image was published here on November 30, 2020.