Use a reverse-image search on photos provided by the seller. If the same animal appears on multiple unrelated sites, it is likely a fake advertisement.
Platforms like Petfinder or the Shelter Pet Project allow you to find small pets (rabbits, guinea pigs, etc.) from local rescues online. buy small pets online
Avoid sellers who insist on non-refundable payment methods like wire transfers, gift cards, or cryptocurrency. Use a reverse-image search on photos provided by the seller