Dog's 可能负数更合适 dogs' greeting(s) 单数、负数好像都可以 --- dog's 一只狗的 / dogs' 几只狗的

你可以查 idioms 就知道 "walk a dog on a leash" (带被戴上狗链的狗散步) 或 "keep a dog on a leash" --- In this picture, we can see a man and a woman who each walk their dog on a leash. At their encounter, both turn their heads away, pretending not to see each other.

In contrast to to their owners, the two pets warmly greet each other.

ironically, the title of the picture is "neighbors".

It seems unbelievable but it is true, maybe even more serious in real life.

How can such a phenomenon occur?

i think there are several reasons and will give the following explanation:

first of all, modern life style changes people a lot.

we are now busier than ever to reach targets like job hunting, work promotion, various meetings or all kinds of activities we deem important.

keeping focus is good, but it filters our life and make us lose a lot.

what is more, the dwelling environment also confines us and cuts off the connections to our neighbors.

the cold and hard steel door and the door bell are your whole impression of your neighbor.

in modern living environment, chances to make new acquaintances are rare even including people that happen to be neighbors.