Well. I remember my kitty from childhood. It was very skinny in the begging as I found her on the streets. It black color became brown-ish because of the dirt on it. I went home and I washed it. Its brown-ish fur became instantly darker than the night and shiny as the moon...In 2 weeks it gained weight and looked better. In 2 months, it became like a fluffy ball. One can barely could differentiate between its eyes, ears and tail (was short) .