We have a Beware of the Dog sign on our gate, need advice?

i dont agree i have a big lab mix nice as can be along with a 100lb doberman and he also is nice as can be but i still put the signs up if someone comes over an meets your dogs then they'll know not to be afraid but if someone was to come over that fence that was supposed to be there and my dog bites im covered because i clearly said beware of dog who cares keep it up