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
Well what happens is that you sell the animal you are abandoning, and then say people come in to the animal shelter and if the animal you abandoned is still OK to live, then they could either buy or rent the animal. But if not well enough to take home, then the abandoned animal will get killed. But if by abandon you mean to simply walk away from the animal without even bringing it to a shelter, then what happens depends on a few things. The assumption is that you are talking about a pet. Abandoning a pet is a serious betrayal; presumably you accepted responsibility for the care and upkeep of the animal, and you are failing to live up to that responsibility. Abandoning a pet, no matter what other conditions there are, will cause the animal stress. Yes, animals do experience stress. If you abandon the animal inside a building with no way for the animal to escape, it will suffer hunger and thirst, among many other things.