Need help with the beginning of a video.

Hi I saw this video earlier

https://www.youtube.com/watch?v=sH93XJz_4Ns

The English lyrics are included in the description, but I thought I would try to listen to it and see if I could understand what he's saying. I managed to get some of it correct.

But the beginning, at 0:12 to 0:16
I could hear he said something like
"Это история..." and I can't make out the rest.

Can anyone tell me what he says?
Thanks

Это история про одного пса.

Thanks so much, my vocabulary isn't perfect yet, so I didn't know "Пса' was a word used for "dog"

пёс is one of the few kooky words that loses a vowel when endings are added.
п(ё)са - genitive singular

Usually it's a 'е' or 'о' that gets dropped.
In the case of окно́, when the final o is dropped, an o is added: о́кон

That's a little confusing to remember xD but I think I understand now, thanks ^-^