Not Lost
Some people put up signs for no reason at all. It has nothing to do with them losing something. This guy just wanted to brag about how great his dog, Gilligan, is. And let’s be honest, based on the sound of this sign, he’s pretty cute too! I agree with you- these pets are fantastic. But what if, if we do this, someone wants to kidnap your pet? Nobody would want their pet kidnapped!
Not So Friendly
The prevalence of these signs is indicative of most people’s lighthearted attitude when they joke around on the internet. The wording also matches that of the last poster on the list. It may not be the intention, but this sign could imply that possums are harmful, which is inaccurate. While these critters can’t catch rabies, they’re otherwise harmless, so people should stay away from them.