Facebook has banned animal for sale ads,  it will cause more horses being slaughtered, dogs and cats being dumped.

This change is bad for both pets and livestock. The opportunity to screen homes and get to know buyers and sellers will be gone . Small, reputable breeders and farmers will lose their primary place to market their animals to good homes, forcing them to turn to high risk alternatives like auctions. But the puppy mills and the irresponsible breeders will continue as they always have, making money off the uninformed. 

This change hurts everyone - pets, sellers, and buyers alike.