we adopt animals not sell them and the number depends on the shelter
you shouldn't sell animals on facebook.
you should get your first cat(or any cat) at the animal shelter. they sell healthy animals that need homes.
In Farmville 2, you can sell animals by visiting your farm and selecting the animal you want to sell. Tap on the animal, and you'll see an option to sell it, usually represented by a dollar sign icon. Confirm the sale, and the animal will be removed from your farm, providing you with coins in return. Alternatively, you can sell animals at the market to other players for additional profit.
Anything and everything, except maybe pets. Bring them to your animal shelter.
animals or animal supplies
There are many possibilities, you can give some to friends or acquaintances, you can sell them on ebay, you can give them to the animal shelter, and many more.
you click on the animal and then click the sell button.
If the zoo doesn't want an animal, they sell them to a different zoo
They get taken by animal keepers and they sell them!
Only the sickest and most disgusting shelters would sell there animals, but yes it does happen and shelters that dont sell often get tricked by people who come in saying they wont a petb but then carry them off to a lab to be tested on!!!
on certain days
Sell stuff or/and help animals. You need to save up.