Barky dogs in general, but worse the sort that charge the fence of the property as you walk by. On our regular Sunday perambulations, there's two places that let their dogs roam like this. They can't get through the fence (but you don't know this the first time), but the dogs are going crazy and they're not little dogs, they're giant, slathering hell beasts. As an adult, if you're not expecting them, it's a bit of a shock. But it must be terrifying for little kids.
I'm honestly befuddled why people think shit like that is OK.