As best I can tell, these are little signs that tell you to keep your dog on a leash. These were posted all around a mall called Yebisu Garden Place, located in the Ebisu section of Tokyo.
Edit: Upon further consideration, the one above could actually be a kai ken, rather than a shiba.
These next signs were posted at the Senso-ji Temple. I'm not sure what they mean, but if anyone knows, I'd love to find out.
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