Dogs on Premises Sign

I have had recent issues with people coming to the door and continually knocking and ringing the doorbell, even though I will not open the door. The No Soliciting sign doesn't always work if people are persistent. This sign lets them know that I have dogs (Cattle Dogs) and the dogs are behind the door and so far, it is working. I have heard that if you have a sign that says beware of dog, then you know that you have a potentially dangerous dog and you may be liable if someone claims they got bitten. With this sign, Dogs On Premises, people are alerted to the presence of dogs on your property and if they ignore the sign, it's on them if they get bitten.