Whether or not that “beware of dog” sign is real
According to the Bureau of Justice Statistics, 29.5% of the victims of non-violent burglaries knew the burglar, that number jumping to 65.1% in violent burglaries—meaning people who know you and your pets are pretty likely to be the ones committing these crimes .
With that in mind, it’s likely that a burglar is well-aware of that “beware of dog” sign being just for show—especially if they’ve been inside or cased your house before without hearing any barking.
