I live at the end of a close. It probably has about 20 houses in it, to give you an idea of how long the road is. The layout is very open, and any walls at the front are only about a foot high, but there are some shrubs dotted about which are obviously higher.
A man who lives a few houses down has a couple of medium size dogs, and on some days his idea of walking them is to let them roam anywhere they like while he stands at the front of his house watching them. So, they go in everyone's gardens, sniffing about and doing their business. He might shout after them if they go too far away from him, but they do not take much notice of him. If they wander into a back garden, he marches round the back of your house to retrieve them as if he owns the place.
To be fair I have never seem them take a shit which he has not picked up, but it might happen unseen (I certainly do encounter animal shit on my lawn), and they freely pee on my plants and my lawn. It is more the fact that I do not like dogs, and do not like the idea of encountering one off a lead in my front or back garden, and his sense of entitlement about it all.