Come home after leaving them alone for hours and they will still wag their tail and love you like you never left them. Their demands are simple. Walk, play, food, sleep. No matter what the world thinks of you, they will always love you. They aren't just your best friends, they are your companions for as long as they live.

Here are 8 posters that show why a dog is, for sure, a man's best friend:

1.

2.

3.

4.

5.

6.

7.

8.

Source: Singh's Design