1. What punny word did I blur out? It's acting as both a noun here (a potential crime venue) and a verb (an action to take).
2. What punny word did I blur out? My neighbor in Oakland wrote this with the sidewalk chalk I put out for public use.
3. This gang tag (seen on BART) represents what number, twice, in what three writing systems? (Ignore the L.)
4. I don't have any questions about this picture, I just wanted you to see it so you could scream too. The alignment!!
5. What word here isn't quite right, and what should it be?

Solution

1. Curb
2. Town (as in "talk of the town"; Oakland is called The Town)
3. The number is 13, first in a mix of Roman and Arabic numerals, then in Mayan numerals (though Morse code is not far off!)
4. Like this
5. A Datsun has never been observed to breed successfully with a terrier. Probably the sign meant dachshund.

As long as we're on the subject of lost pet signs, there is also, and I cannot stress this enough, this:

Congratulations to yesterday's solvers/screamers Allison, Peter M., Eric, Graham, Kathy, Zachary S., and especially Peter V., who went 5 for 5. Thanks to everybody who made a guess!