That is the cautionary sign that warns people that there’s a dog in the premises. Most of the time, that sign implies that the dog in the premises can be territorial, usually a guard dog.
But sometimes, it’s the total opposite! In the video below, you can see the “Beware of Dog” sign on the gate, and after a few seconds, you’ll see the vicious dogs guarding the property!
….just look at those viciously cute puppies! They’re ready to attack you with kisses and hugs!