If you have a cat, when it is 100%, you get the option to "brush kitten" (it's the kitten version of "harvest").
you brush it and you get its fur.
You get yarn from the cat, and 86 coins
The black cat produces yam.
you get yarn.
80 coins!
yarn
Yarn
Nothing you just brush it and get 80 coins
buy a special cat brush and toothpaste, hold your cat tight and brush like you brush your own teeth, make sure the cat doesn't swallow any toothpaste :)
Same way you get everything else in FarmVille. A friend has to fine a lonely black cat on their farm, post it on their wall, then you have to click on it before all of your friends do.
You can brush laundry powder from a cat's fur using a thick-brittle brush. Brush gently, but firmly, for about 10 minutes. The cat will probably enjoy it.
Yes, it is possible to brush your cat too much. Over-brushing can lead to skin irritation, discomfort, and potentially damage the cat's coat. It is recommended to brush your cat regularly but not excessively.