Invader!
There's a strange dog on the other side of my garden fence! How dare he! Anything I can see, hear or smell from my house or garden is my territory! I didn't mind the dog who used to be there so much, she was there since she was a puppy, so I got used to her. But her humans have gone and taken her with them and other humans have come with this dog. I barked at him through the fence and told him "This is Patch's patch!"