Some burglars may avoid houses that have dogs or be aware of dogs signs.
But not all burglars are deterred by dogs or be aware of dog signs and still may go ahead and burglar the house.
Some dogs you might think are really tough but then when the dog comes up against a burglar they will run and hide or be friendly with the burglar.
Sometimes burglars will have dog treats or even things such as hot dogs etc that the dog will love and then they will feed the dog the food or treats to make the dog happy.
Then while the dog is eating the food or treat the burglar will continue to burgle houses.
So having a big dog that will usually help deter burglars can be a good idea but just having a watch dog or a guard dog doesn't always guarantee that the burglar won't break into your home.
Having burglar alarms and cameras will do more to deter burglars than dogs will.
Also hide any valuables in a safe somewhere that cannot be easily found.