In a lot of countries free cards are available - some of them with an artist's creation, others are commercials for various products/events, and some of them are meant to be "educational".
A while ago, I found this post card:
It translates from Danish to "DANGER. Never leave a dog in a SUN-BAKED CAR" ??!!
It is down-right scary, that you even have to make people aware of this! There are even some cased where parents have left small infants in the car on a hot summerday, unfortunately sometimes even resulting in death.
What on earth were people thinking when doing this?! Ok I'll rephrase it: Why weren't they thinking??!!
Don't they know, that they have responsibilities when having a child or a pet?!