Finding manga

Anirak094 September 4, 2018 7:15 am

so I read a series here but I can only remember the extra story it had and I can't for the life of me remember what the main series is.
So the extra is a about two dogs a large German Shepard (?) And a puppy that no one adopts and the large dog (kuro I think) courts him and sleeps in the cage with him. The big dog eventually has sex with the puppy after he reached puberty and he becomes this beautiful dog and is names white I think....
It left quite the impression so I remember it but what I really want to know is in what story this extra in.

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