It is not God who kills the children. Not fate that butchers them

I am a nameless Indian stray dog.
At the end of that sentence, I still wonder why anybody would be interested in my story or my plight; nevertheless I will go on like I generally do with my life. I scavenge my way around for a meal & look for a quiet corner to rest my scrawny body. It’s a dog’s life.
Sometimes, I wonder regarding the usage of the word dog in so many phrases, a dog’s life