Sure, if someone is really determined to get past guard dogs, they can. But a casual burglar isn't going to bother. One of mine is 95 pounds of black lab/german

Sure, if someone is really determined to get past guard dogs, they can. But a casual burglar isn't going to bother. One of mine is 95 pounds of black lab/german shepherd mutt with a massive baritone bark, but he's totally harmless, except for maybe knocking you over. The other one is 35 pounds and so cute that people assume he's a she, but he's actually bitten at least three different people while overprotecting the house and yard, and I have no doubt he'd die fighting. (And the new next door neighbor learned what he already knew, which was to not stick your hand over the fence to pet the barking dog who doesn't know you and is very concerned that you're in the yard of his friends, even when that dog is small and cute.)