I have been caring for three adult dogs. One of them gave birth to 8 more puppies. We couldn’t find the 8th one after a week. So there were only 7. They were living on the road. Not really on the road but beside the road. They just learned to walk and 2 of them came onto the road. Last week, 2 of the puppies died in an accident. Some ruthless car driver sped away. I cried a lot and I dug 2-speed breakers. Something like this II puppies II. Since then vehicles have been slowing down.
I started caring for the adults since January after my own pet dog passed away. I don’t know why but my pet dogs always die. This was my 2nd dog who was just 1 1/2 yrs old. My first dog passed away when she was 1 1/2yrs too. And no. I am not abusing them or anything. After this, I just put off getting new dogs and started caring for the stray dogs in the neighborhood. Although there are many many stray dogs here, I can’t care of all them because they all fight a lot. There three are kind of like a family. They move together, eat together.
This is not the essay. Just an idea. Just I know death is cliche but I thought this was a bit unique.
While this is a touching story, I don’t think the cliche is the problem - the essay should be more about you and exhibiting some positive quality. I don’t read this and learn much more about you besides that you have a lot of empathy. Not terrible to know, but you can show colleges a lot more that they will like while still being true to yourself and telling a good story.
On a personal note, I really appreciate what you’re trying to do for the dogs. Life is harsh, way too harsh. I’d say try to lighten up your life a bit there - charitable and depressing tasks are great, but make sure you’re doing okay yourself. 
Hope that helps!
Agree with PengsPhils, the point of an essay is to give colleges a reason to accept you. How would this essay do that? It seems like there may be better topics for you to write about.
If you move away from how their deaths anguished you and focus more on how you took agency from them to create change and prevent further accidents, I’d stand behind it.
Depending on the prompt, it could be used to show how you’re both able to see issues and make change to fix them in your community. If positive action is an outlet for you, you could build greatly off that either with this idea or another.