Today’s cartoon is from Red and Rover, a strip set more or less in the 1960s, when a lot more kids spent their entire summers barefoot.
It appeared just this past Tuesday, August 26, 2014.
This was a common problem (and yes, in the comic strip, Red really has spent his entire summer barefoot). Additionally, with the reference to Hawaii, I wonder if the cartoonist sometimes listens in to barefooters’ discussions.